Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Saem's Tunes AI
+
+We love your input! We want to make contributing to Saem's Tunes AI as easy and transparent as possible.
+
+## Development Process
+
+1. Fork the repo and create your branch from `main`
+2. Make your changes
+3. Add tests for new functionality
+4. Ensure all tests pass
+5. Submit a pull request
+
+## Code Style
+
+- Use Black for code formatting
+- Follow PEP 8 guidelines
+- Write type hints for all functions
+- Include docstrings for public methods
+
+## Testing
+
+```bash
+# Run all tests
+pytest
+
+# Run with coverage
+pytest --cov=src
+
+# Run specific test file
+pytest tests/test_ai_system.py