docs: add contributing guides

Author: marandaneto

CONTRIBUTING.md

@@ -0,0 +1,51 @@
+# Contributing
+
+Thanks for your interest in improving the PostHog Elixir SDK.
+
+## Developing locally
+
+Fetch dependencies and run the test suite from the repository root:
+
+```bash
+mix deps.get
+mix test
+```
+
+### Integration tests
+
+To run the integration test suite that sends real events to the API:
+
+1. Create a test PostHog project and obtain an API key.
+2. Create `config/integration.exs` from the example file:
+
+   ```bash
+   cp config/integration.example.exs config/integration.exs
+   ```
+
+3. Put your API key into `config/integration.exs`.
+4. Run the integration tests:
+
+   ```bash
+   mix test --only integration
+   ```
+
+### Local development config
+
+If you want to play with PostHog events in IEx, create `config/dev.override.exs` and point it at the instance of your choosing. This file is gitignored. A minimal example:
+
+```elixir
+# config/dev.override.exs
+import Config
+
+config :posthog,
+  enable: true,
+  api_host: "https://us.i.posthog.com",
+  api_key: "phc_XXXX"
+```
+
+## Pull requests
+
+1. Fork the repository and create your feature branch.
+2. Make your changes and ensure tests pass with `mix test`.
+3. Run `mix format` and `mix credo --strict` to ensure code quality.
+4. Open a pull request.

README.md

@@ -253,52 +253,6 @@ and using a different HTTP library entirely.
 If your app works with multiple PostHog projects, PostHog can accommodate you. For
 setup instructions, consult the [advanced configuration guide](guides/advanced-configuration.md).
 
-## Developing locally
-
-You should be able to fetch dependencies and run tests right away:
-
-```
-mix deps.get
-mix test
-```
-
-To run integration test suite that sends real events to the API:
-
-1. Create a test PostHog project and obtain an API key.
-2. Create `config/integration.exs` config that will be used for integration tests:
-
-```
-cp config/integration.example.exs config/integration.exs
-```
-
-3. Put API key into `config/integration.exs`
-4. Run integration tests
-
-```
-mix test --only integration
-```
-
-If you want to play with PostHog events in IEx, just create
-`config/dev.override.exs` and tweak it to point to the instance of your liking.
-This config will be gitignored. Here's a minimal example:
-
-```elixir
-# config/dev.override.exs
-import Config
-
-config :posthog,
-  enable: true
-  api_host: "https://us.i.posthog.com",
-  api_key: "phc_XXXX"
-```
-
 ## Contributing
 
-We welcome contributions! Here's how to get started:
-
-1. Fork the repository and create your feature branch
-2. Make your changes and ensure tests pass with `mix test`
-3. Run `mix format` and `mix credo --strict` to ensure code quality
-4. Open a Pull Request
-
-For changeset and release instructions, see [RELEASING.md](RELEASING.md).
+See [CONTRIBUTING.md](CONTRIBUTING.md) for local setup, integration test, and pull request guidelines.

sdk_compliance_adapter/CONTRIBUTING.md

@@ -0,0 +1,44 @@
+# Contributing
+
+This package contains the PostHog Elixir SDK compliance adapter used with the PostHog SDK Test Harness.
+
+## Running tests
+
+Tests run automatically in CI via GitHub Actions.
+
+### Locally with Docker Compose
+
+Run the full compliance suite from the `sdk_compliance_adapter` directory:
+
+```bash
+docker-compose up --build --abort-on-container-exit
+```
+
+This will:
+
+1. Build the Elixir SDK adapter
+2. Pull the test harness image
+3. Run all compliance tests
+4. Show the results
+
+### Manually with Docker
+
+```bash
+# Create network
+docker network create test-network
+
+# Build and run adapter
+docker build -f sdk_compliance_adapter/Dockerfile -t posthog-elixir-adapter .
+docker run -d --name sdk-adapter --network test-network -p 8080:8080 posthog-elixir-adapter
+
+# Run test harness
+docker run --rm \
+  --name test-harness \
+  --network test-network \
+  ghcr.io/posthog/sdk-test-harness:latest \
+  run --adapter-url http://sdk-adapter:8080 --mock-url http://test-harness:8081
+
+# Cleanup
+docker stop sdk-adapter && docker rm sdk-adapter
+docker network rm test-network
+```

sdk_compliance_adapter/README.md

@@ -2,45 +2,9 @@
 
 This adapter wraps the posthog-elixir SDK for compliance testing with the [PostHog SDK Test Harness](https://github.com/PostHog/posthog-sdk-test-harness).
 
-## Running Tests
+## Contributing
 
-Tests run automatically in CI via GitHub Actions. See the test harness repo for details.
-
-### Locally with Docker Compose
-
-```bash
-# From the posthog-elixir/sdk_compliance_adapter directory
-docker-compose up --build --abort-on-container-exit
-```
-
-This will:
-
-1. Build the Elixir SDK adapter
-2. Pull the test harness image
-3. Run all compliance tests
-4. Show results
-
-### Manually with Docker
-
-```bash
-# Create network
-docker network create test-network
-
-# Build and run adapter
-docker build -f sdk_compliance_adapter/Dockerfile -t posthog-elixir-adapter .
-docker run -d --name sdk-adapter --network test-network -p 8080:8080 posthog-elixir-adapter
-
-# Run test harness
-docker run --rm \
-  --name test-harness \
-  --network test-network \
-  ghcr.io/posthog/sdk-test-harness:latest \
-  run --adapter-url http://sdk-adapter:8080 --mock-url http://test-harness:8081
-
-# Cleanup
-docker stop sdk-adapter && docker rm sdk-adapter
-docker network rm test-network
-```
+See [CONTRIBUTING.md](CONTRIBUTING.md) for local build and compliance test instructions.
 
 ## Implementation