add contributing.md and update docs

Author: sestinj

CONTRIBUTING.md

@@ -0,0 +1,48 @@
+# Contributing to Rules CLI
+
+## Development Setup
+
+### Prerequisites
+
+- Go 1.24.2+
+- Node.js 12+ (for packaging)
+
+### Local Development
+
+```bash
+# Clone the repository
+git clone https://github.com/continuedev/rules.git
+cd rules
+
+# Install dependencies
+go mod download
+
+# Build the CLI
+go build
+
+# Test your changes
+go test ./...
+```
+
+## Making Changes
+
+1. **Fork the repository** and create a feature branch
+2. **Make your changes** following these guidelines:
+   - Keep commits focused and atomic
+   - Add tests for new functionality
+   - Update documentation if needed
+3. **Test your changes** locally
+4. **Include a clear description** in your pull request
+
+## Release Process
+
+Releases are automated via semantic-release. Use conventional commit messages:
+
+- `fix:` for bug fixes
+- `feat:` for new features
+- `docs:` for documentation changes
+- `BREAKING CHANGE:` for breaking changes
+
+## Questions?
+
+Open an issue for bugs, feature requests, or questions.

docs-main/index.mdx

@@ -78,4 +78,4 @@ If you are building a developer tool and want to optimize how AI IDEs work with
 
 ### Contributing
 
-`rules` will be released as open source very soon! In the meantime, you can help by sharing feedback and rules!
+[`rules` is open-sourced](https://github.com/continuedev/rules) under the Apache 2.0 license. If you're interested in contributing, learn more [here](https://github.com/continuedev/rules/blob/main/CONTRIBUTING.md).