docs: add CONTRIBUTING.md

Author: Jaypatel1511

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in contributing! Here's how to get started.
+
+## Getting Started
+
+1. Fork the repository
+2. Clone your fork locally
+3. Install dependencies:
+
+    pip install -e .
+    pip install pytest
+
+4. Run the tests to confirm everything works:
+
+    PYTHONPATH=. pytest tests/ -v
+
+## Making Changes
+
+1. Create a new branch:
+
+    git checkout -b fix/your-fix-name
+
+2. Make your changes
+3. Add or update tests to cover your changes
+4. Run the full test suite — all tests must pass
+5. Commit with a clear message:
+
+    git commit -m "fix: description of what you fixed"
+
+6. Push and open a Pull Request against main
+
+## Pull Request Guidelines
+
+- Keep PRs focused — one fix or feature per PR
+- All tests must pass before merging
+- Add tests for any new functionality
+- Update the README if you add new features or change the API
+- Use clear, descriptive commit messages
+
+## Reporting Issues
+
+Please open a GitHub Issue with:
+- A clear description of the problem
+- Steps to reproduce it
+- Expected vs actual behavior
+- Your Python version and OS
+
+## Code Style
+
+- Follow existing code style in the repo
+- Use type hints where possible
+- Add docstrings to public functions and classes
+- Keep functions focused and single-purpose
+
+## License
+
+By contributing, you agree that your contributions will be licensed
+under the MIT License.