docs: add CONTRIBUTING.md

Author: h4x3rotab

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in contributing to this project!
+
+## Development
+
+1. Fork the repository
+2. Create a feature branch (`git checkout -b feature/amazing-feature`)
+3. Make your changes
+4. Commit your changes using conventional commits
+5. Push to the branch (`git push origin feature/amazing-feature`)
+6. Open a Pull Request
+
+## Commit Convention
+
+This project uses [Conventional Commits](https://www.conventionalcommits.org/). Please format your commit messages as:
+
+```
+<type>: <description>
+
+[optional body]
+```
+
+Examples:
+- `feat: add user authentication`
+- `fix: resolve memory leak in worker process`
+- `docs: update API documentation`
+
+## Changelog
+
+The changelog is automatically generated using [git-cliff](https://git-cliff.org/). To update the changelog:
+
+```bash
+git-cliff --output CHANGELOG.md
+```
+
+The changelog follows the [Keep a Changelog](https://keepachangelog.com/) format and includes GitHub integration for PR links and contributor recognition.