Add CONTRIBUTING.md (RSR compliance)

Author: hyperpolymath

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in contributing!
+
+## How to Contribute
+
+1. Fork the repository
+2. Create a feature branch
+3. Make your changes
+4. Submit a pull request
+
+## Code Standards
+
+This project follows [RSR (Rhodium Standard Repository)](https://github.com/hyperpolymath/rhodium-standard-repositories) guidelines.
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the same license as the project.
+