Create CONTRIBUTING.md

CONTRIBUTING.md

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+## Contributing
+
+Contributions are welcome! To contribute to this project:
+
+1. **Fork the repository** and clone your fork locally.
+2. **Create a new branch** for your feature or bugfix:
+   ```bash
+   git checkout -b my-feature
+   ```
+3. **Install dependencies** using Poetry:
+   ```bash
+   poetry install
+   ```
+4. **Make your changes** and add tests as needed.
+5. **Run tests** to ensure everything works:
+   ```bash
+   poetry run pytest
+   ```
+6. **Format your code** with Black:
+   ```bash
+   poetry run black .
+   ```
+7. **Commit and push** your changes to your fork.
+8. **Open a pull request** describing your changes.
+
+Please follow the existing code style and add tests for new features or bugfixes.