diff --git a/.check.exs b/.check.exs
new file mode 100644
index 0000000..ab798a2
--- /dev/null
+++ b/.check.exs
@@ -0,0 +1,20 @@
+[
+  ## all available options with default values (see `mix check` docs for description)
+  # parallel: true,
+  # skipped: true,
+  retry: false,
+  ## list of tools (see `mix check` docs for defaults)
+  tools: [
+    ## curated tools may be disabled (e.g. the check for compilation warnings)
+    # {:compiler, false},
+
+    ## ...or adjusted (e.g. use one-line formatter for more compact credo output)
+    # {:credo, "mix credo --format oneline"},
+
+    {:check_formatter, command: "mix spark.formatter --check"},
+    ## custom new tools may be added (mix tasks or arbitrary commands)
+    # {:my_mix_task, command: "mix release", env: %{"MIX_ENV" => "prod"}},
+    # {:my_arbitrary_tool, command: "npm test", cd: "assets"},
+    # {:my_arbitrary_script, command: ["my_script", "argument with spaces"], cd: "scripts"}
+  ]
+]
diff --git a/.credo.exs b/.credo.exs
new file mode 100644
index 0000000..a986fd0
--- /dev/null
+++ b/.credo.exs
@@ -0,0 +1,184 @@
+# This file contains the configuration for Credo and you are probably reading
+# this after creating it with `mix credo.gen.config`.
+#
+# If you find anything wrong or unclear in this file, please report an
+# issue on GitHub: https://github.com/rrrene/credo/issues
+#
+%{
+  #
+  # You can have as many configs as you like in the `configs:` field.
+  configs: [
+    %{
+      #
+      # Run any config using `mix credo -C <name>`. If no config name is given
+      # "default" is used.
+      #
+      name: "default",
+      #
+      # These are the files included in the analysis:
+      files: %{
+        #
+        # You can give explicit globs or simply directories.
+        # In the latter case `**/*.{ex,exs}` will be used.
+        #
+        included: [
+          "lib/",
+          "src/",
+          "test/",
+          "web/",
+          "apps/*/lib/",
+          "apps/*/src/",
+          "apps/*/test/",
+          "apps/*/web/"
+        ],
+        excluded: [~r"/_build/", ~r"/deps/", ~r"/node_modules/"]
+      },
+      #
+      # Load and configure plugins here:
+      #
+      plugins: [],
+      #
+      # If you create your own checks, you must specify the source files for
+      # them here, so they can be loaded by Credo before running the analysis.
+      #
+      requires: [],
+      #
+      # If you want to enforce a style guide and need a more traditional linting
+      # experience, you can change `strict` to `true` below:
+      #
+      strict: false,
+      #
+      # To modify the timeout for parsing files, change this value:
+      #
+      parse_timeout: 5000,
+      #
+      # If you want to use uncolored output by default, you can change `color`
+      # to `false` below:
+      #
+      color: true,
+      #
+      # You can customize the parameters of any check by adding a second element
+      # to the tuple.
+      #
+      # To disable a check put `false` as second element:
+      #
+      #     {Credo.Check.Design.DuplicatedCode, false}
+      #
+      checks: [
+        #
+        ## Consistency Checks
+        #
+        {Credo.Check.Consistency.ExceptionNames, []},
+        {Credo.Check.Consistency.LineEndings, []},
+        {Credo.Check.Consistency.ParameterPatternMatching, []},
+        {Credo.Check.Consistency.SpaceAroundOperators, false},
+        {Credo.Check.Consistency.SpaceInParentheses, []},
+        {Credo.Check.Consistency.TabsOrSpaces, []},
+
+        #
+        ## Design Checks
+        #
+        # You can customize the priority of any check
+        # Priority values are: `low, normal, high, higher`
+        #
+        {Credo.Check.Design.AliasUsage, false},
+        # You can also customize the exit_status of each check.
+        # If you don't want TODO comments to cause `mix credo` to fail, just
+        # set this value to 0 (zero).
+        #
+        {Credo.Check.Design.TagTODO, false},
+        {Credo.Check.Design.TagFIXME, []},
+
+        #
+        ## Readability Checks
+        #
+        {Credo.Check.Readability.AliasOrder, []},
+        {Credo.Check.Readability.FunctionNames, []},
+        {Credo.Check.Readability.LargeNumbers, []},
+        {Credo.Check.Readability.MaxLineLength, [priority: :low, max_length: 120]},
+        {Credo.Check.Readability.ModuleAttributeNames, []},
+        {Credo.Check.Readability.ModuleDoc, []},
+        {Credo.Check.Readability.ModuleNames, []},
+        {Credo.Check.Readability.ParenthesesInCondition, false},
+        {Credo.Check.Readability.ParenthesesOnZeroArityDefs, []},
+        {Credo.Check.Readability.PredicateFunctionNames, []},
+        {Credo.Check.Readability.PreferImplicitTry, []},
+        {Credo.Check.Readability.RedundantBlankLines, []},
+        {Credo.Check.Readability.Semicolons, []},
+        {Credo.Check.Readability.SpaceAfterCommas, []},
+        {Credo.Check.Readability.StringSigils, []},
+        {Credo.Check.Readability.TrailingBlankLine, []},
+        {Credo.Check.Readability.TrailingWhiteSpace, []},
+        {Credo.Check.Readability.UnnecessaryAliasExpansion, []},
+        {Credo.Check.Readability.VariableNames, []},
+
+        #
+        ## Refactoring Opportunities
+        #
+        {Credo.Check.Refactor.CondStatements, []},
+        {Credo.Check.Refactor.CyclomaticComplexity, false},
+        {Credo.Check.Refactor.FunctionArity, []},
+        {Credo.Check.Refactor.LongQuoteBlocks, []},
+        {Credo.Check.Refactor.MapInto, []},
+        {Credo.Check.Refactor.MatchInCondition, []},
+        {Credo.Check.Refactor.NegatedConditionsInUnless, []},
+        {Credo.Check.Refactor.NegatedConditionsWithElse, []},
+        {Credo.Check.Refactor.Nesting, [max_nesting: 5]},
+        {Credo.Check.Refactor.UnlessWithElse, []},
+        {Credo.Check.Refactor.WithClauses, []},
+
+        #
+        ## Warnings
+        #
+        {Credo.Check.Warning.BoolOperationOnSameValues, []},
+        {Credo.Check.Warning.ExpensiveEmptyEnumCheck, []},
+        {Credo.Check.Warning.IExPry, []},
+        {Credo.Check.Warning.IoInspect, []},
+        {Credo.Check.Warning.LazyLogging, []},
+        {Credo.Check.Warning.MixEnv, false},
+        {Credo.Check.Warning.OperationOnSameValues, []},
+        {Credo.Check.Warning.OperationWithConstantResult, []},
+        {Credo.Check.Warning.RaiseInsideRescue, []},
+        {Credo.Check.Warning.UnusedEnumOperation, []},
+        {Credo.Check.Warning.UnusedFileOperation, []},
+        {Credo.Check.Warning.UnusedKeywordOperation, []},
+        {Credo.Check.Warning.UnusedListOperation, []},
+        {Credo.Check.Warning.UnusedPathOperation, []},
+        {Credo.Check.Warning.UnusedRegexOperation, []},
+        {Credo.Check.Warning.UnusedStringOperation, []},
+        {Credo.Check.Warning.UnusedTupleOperation, []},
+        {Credo.Check.Warning.UnsafeExec, []},
+
+        #
+        # Checks scheduled for next check update (opt-in for now, just replace `false` with `[]`)
+
+        #
+        # Controversial and experimental checks (opt-in, just replace `false` with `[]`)
+        #
+        {Credo.Check.Readability.StrictModuleLayout, false},
+        {Credo.Check.Consistency.MultiAliasImportRequireUse, false},
+        {Credo.Check.Consistency.UnusedVariableNames, false},
+        {Credo.Check.Design.DuplicatedCode, false},
+        {Credo.Check.Readability.AliasAs, false},
+        {Credo.Check.Readability.MultiAlias, false},
+        {Credo.Check.Readability.Specs, false},
+        {Credo.Check.Readability.SinglePipe, false},
+        {Credo.Check.Readability.WithCustomTaggedTuple, false},
+        {Credo.Check.Refactor.ABCSize, false},
+        {Credo.Check.Refactor.AppendSingleItem, false},
+        {Credo.Check.Refactor.DoubleBooleanNegation, false},
+        {Credo.Check.Refactor.ModuleDependencies, false},
+        {Credo.Check.Refactor.NegatedIsNil, false},
+        {Credo.Check.Refactor.PipeChainStart, false},
+        {Credo.Check.Refactor.VariableRebinding, false},
+        {Credo.Check.Warning.LeakyEnvironment, false},
+        {Credo.Check.Warning.MapGetUnsafePass, false},
+        {Credo.Check.Warning.UnsafeToAtom, false}
+
+        #
+        # Custom checks can be created using `mix credo.gen.check`.
+        #
+      ]
+    }
+  ]
+}
diff --git a/.github/CODE_OF_CONDUCT.md b/.github/CODE_OF_CONDUCT.md
new file mode 100644
index 0000000..7aa6f74
--- /dev/null
+++ b/.github/CODE_OF_CONDUCT.md
@@ -0,0 +1,76 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+ advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+ address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+ professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at zach@zachdaniel.dev. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq
diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
new file mode 100644
index 0000000..f537454
--- /dev/null
+++ b/.github/CONTRIBUTING.md
@@ -0,0 +1,2 @@
+# Contributing Guidelines
+Contributing guidelines can be found in the core project, [ash](https://github.com/ash-project/ash/blob/main/.github/CONTRIBUTING.md)
diff --git a/.github/ISSUE_TEMPLATE/bug_report.md b/.github/ISSUE_TEMPLATE/bug_report.md
new file mode 100644
index 0000000..1f47341
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -0,0 +1,27 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug, needs review
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is. If you are not sure if the bug is related to `ash` or an extension, log it with [ash](https://github.com/ash-project/ash/issues/new) and we will move it.
+
+**To Reproduce**
+A minimal set of resource definitions and calls that can reproduce the bug.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+** Runtime
+ - Elixir version
+ - Erlang version
+ - OS
+ - Ash version
+ - any related extension versions
+
+**Additional context**
+Add any other context about the problem here.
diff --git a/.github/ISSUE_TEMPLATE/feature_request.md b/.github/ISSUE_TEMPLATE/feature_request.md
new file mode 100644
index 0000000..f347dcb
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/feature_request.md
@@ -0,0 +1,36 @@
+---
+name: Proposal
+about: Suggest an idea for this project
+title: ''
+labels: enhancement, needs review
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Express the feature either with a change to resource syntax, or with a change to the resource interface**
+
+For example
+
+```elixir
+  attributes do
+    attribute :foo, :integer, bar: 10 # <- Adding `bar` here would cause <x>
+  end
+```
+
+Or
+
+```elixir
+  Api.read(:resource, bar: 10) # <- Adding `bar` here would cause <x>
+```
+
+**Additional context**
+Add any other context or screenshots about the feature request here.
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 0000000..8c13744
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,4 @@
+### Contributor checklist
+
+- [ ] Bug fixes include regression tests
+- [ ] Features include unit/acceptance tests
diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
new file mode 100644
index 0000000..059c144
--- /dev/null
+++ b/.github/workflows/elixir.yml
@@ -0,0 +1,13 @@
+name: CI
+on:
+  push:
+    tags:
+      - "v*"
+    branches: [main]
+  pull_request:
+    branches: [main]
+jobs:
+  ash-ci:
+    uses: ash-project/ash/.github/workflows/ash-ci.yml@main
+    secrets:
+      hex_api_key: ${{ secrets.HEX_API_KEY }}
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..4eb51a5
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 Zachary Scott Daniel
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/logos/small-logo.png b/logos/small-logo.png
new file mode 100644
index 0000000..9fc9aa1
Binary files /dev/null and b/logos/small-logo.png differ
diff --git a/mix.exs b/mix.exs
index f111497..dca7194 100644
--- a/mix.exs
+++ b/mix.exs
@@ -2,6 +2,9 @@ defmodule AshDoubleEntry.MixProject do
   use Mix.Project
 
   @version "0.1.0"
+  @description """
+  A customizable double entry bookkeeping system backed by Ash resources.
+  """
 
   def project do
     [
@@ -10,8 +13,14 @@ defmodule AshDoubleEntry.MixProject do
       elixir: "~> 1.15",
       start_permanent: Mix.env() == :prod,
       consolidate_protocols: Mix.env() != :test,
+      description: @description,
       aliases: aliases(),
-      deps: deps()
+      deps: deps(),
+      package: package(),
+      docs: docs(),
+      source_url: "https://github.com/ash-project/ash_double_entry",
+      homepage_url: "https://github.com/ash-project/ash_double_entry",
+      consolidate_protocols: Mix.env() != :test
     ]
   end
 
@@ -22,6 +31,18 @@ defmodule AshDoubleEntry.MixProject do
     ]
   end
 
+  defp package do
+    [
+      name: :ash_double_entry,
+      licenses: ["MIT"],
+      files: ~w(lib .formatter.exs mix.exs README* LICENSE*
+        CHANGELOG* documentation),
+      links: %{
+        GitHub: "https://github.com/ash-project/ash_double_entry"
+      }
+    ]
+  end
+
   defp aliases do
     [
       sobelow: "sobelow --skip",
@@ -32,6 +53,81 @@ defmodule AshDoubleEntry.MixProject do
     ]
   end
 
+  defp extras() do
+    "documentation/**/*.md"
+    |> Path.wildcard()
+    |> Enum.map(fn path ->
+      title =
+        path
+        |> Path.basename(".md")
+        |> String.split(~r/[-_]/)
+        |> Enum.map(&String.capitalize/1)
+        |> Enum.join(" ")
+        |> case do
+          "F A Q" ->
+            "FAQ"
+
+          other ->
+            other
+        end
+
+      {String.to_atom(path),
+       [
+         title: title
+       ]}
+    end)
+  end
+
+  defp groups_for_extras() do
+    "documentation/*"
+    |> Path.wildcard()
+    |> Enum.map(fn folder ->
+      name =
+        folder
+        |> Path.basename()
+        |> String.split(~r/[-_]/)
+        |> Enum.map(&String.capitalize/1)
+        |> Enum.join(" ")
+
+      {name, folder |> Path.join("**") |> Path.wildcard()}
+    end)
+  end
+
+  defp docs do
+    [
+      main: "get-started-with-double-entry",
+      source_ref: "v#{@version}",
+      logo: "logos/small-logo.png",
+      extras: extras(),
+      spark: [
+        extensions: [
+          %{
+            module: AshDoubleEntry.Balance,
+            name: "AshDoubleEntry.Balance",
+            target: "Ash.Resource",
+            type: "Extension"
+          },
+          %{
+            module: AshDoubleEntry.Transfer,
+            name: "AshDoubleEntry.Transfer",
+            target: "Ash.Resource",
+            type: "Extension"
+          },
+          %{
+            module: AshDoubleEntry.Balance,
+            name: "AshDoubleEntry.Balance",
+            target: "Ash.Resource",
+            type: "Extension"
+          }
+        ]
+      ],
+      groups_for_extras: groups_for_extras(),
+      groups_for_modules: [
+        Internals: ~r/.*/
+      ]
+    ]
+  end
+
   # Run "mix help deps" to learn about dependencies.
   defp deps do
     [