diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 00000000..296ebfd5
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,87 @@
+# Contributing
+
+Thanks for helping improve Lua-CSharp. This project is a Lua interpreter and C# interop library for .NET and Unity, so changes should keep correctness, performance, and AOT-friendly behavior in mind.
+
+## Pull Requests
+
+1. Fork the repository and create your branch from `main`.
+2. Keep changes focused. Separate unrelated fixes or refactors into separate pull requests.
+3. Add or update tests when changing runtime behavior, source generation, standard libraries, or public APIs.
+4. Run the relevant test suite locally before opening a pull request:
+
+   ```sh
+   dotnet test
+   ```
+
+   For focused changes, you can run a narrower filter, for example:
+
+   ```sh
+   dotnet test tests/Lua.Tests/Lua.Tests.csproj --filter LuaObjectTests
+   ```
+
+5. Update documentation when changing public behavior or user-facing APIs.
+6. Address review feedback promptly.
+
+## Bug Fixes
+
+When fixing a bug, please include:
+
+- A short description of the problem.
+- A test that fails before the fix and passes after it, when practical.
+- Notes about any compatibility or performance impact.
+
+## Issues
+
+Use GitHub issues for bug reports, feature requests, and design discussions. Please include enough detail to reproduce the problem:
+
+- Lua-CSharp version or commit.
+- .NET/runtime version.
+- Unity version, if applicable.
+- Minimal C# and Lua code that demonstrates the issue.
+- Expected behavior and actual behavior.
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the MIT license in the root `LICENSE` file.
+
+## Development
+
+The repository uses the .NET SDK and can be built from the repo root.
+
+### Build
+
+```sh
+dotnet build Lua.slnx -c Release
+```
+
+If you only want to build the NuGet package project:
+
+```sh
+dotnet build src/Lua/Lua.csproj -c Release
+```
+
+### Run Tests
+
+```sh
+dotnet test tests/Lua.Tests/Lua.Tests.csproj -c Release
+```
+
+### Inherited Lua Tests
+
+The test project includes a set of `.lua` conformance-style tests inherited from the official Lua repository. Most of them are expected to pass, but a few known cases are currently marked with the `ExpectedFailure` category in the test suite.
+
+To run the test project while excluding those known failures:
+
+```sh
+dotnet test tests/Lua.Tests/Lua.Tests.csproj -c Release --filter "TestCategory!=ExpectedFailure"
+```
+
+This is the same filter used in GitHub Actions when packing and publishing the NuGet package.
+
+### Pack for NuGet
+
+```sh
+dotnet pack src/Lua/Lua.csproj -c Release -o ./artifacts/nuget
+```
+
+The package version is defined in `Directory.Build.props`. After packing, the `.nupkg` file will be written to `artifacts/nuget/`.
diff --git a/README.md b/README.md
index e254236f..b4140284 100644
--- a/README.md
+++ b/README.md
@@ -228,7 +228,7 @@ state.Environment["add"] = new LuaFunction((context, ct) =>
 
     // Set the return value to the context
     context.Return(arg0 + arg1);
-    
+
     // If there are multiple values, you need to pass them together as follows.
     // context.Return(arg0, arg1);
     // context.Return([arg0, arg1]);
@@ -459,7 +459,7 @@ public partial class LuaVector3
             vector = a.vector + b.vector
         };
     }
-    
+
     [LuaMetamethod(LuaObjectMetamethod.Sub)]
     public static LuaVector3 Sub(LuaVector3 a, LuaVector3 b)
     {
@@ -646,4 +646,4 @@ While `collectgarbage()` is available, it simply calls the corresponding .NET ga
 
 ## License
 
-Lua-CSharp is licensed under the [MIT License](LICENSE).
\ No newline at end of file
+Lua-CSharp is licensed under the [MIT License](LICENSE).