Create CONTRIBUTING.rst

Author: CarterPerez-dev

docs/templates/CONTRIBUTING.rst

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+====================================
+Contributing to XYZ
+====================================
+
+Thank you for your interest in contributing to **XYZ**!
+
+----
+
+Development Setup
+=================
+
+1. Clone the repository::
+
+    git clone https://github.com/CarterPerez-dev/XYZ.git
+    cd stripe-referral
+
+2. Create a virtual environment::
+
+    python -m venv venv
+    source venv/bin/activate  # On Windows: venv\Scripts\activate
+
+3. Install in development mode::
+
+    pip install -e ".[dev]"
+
+4. Set up your environment::
+
+    cp .env.example .env
+    # Edit .env with your database URL and API keys
+
+5. Run database migrations::
+
+    alembic upgrade head
+
+----
+
+Code Style
+==========
+
+This project follows strict coding standards:
+
+Formatting
+----------
+
+- **Formatter**: Use ``yapf`` for code formatting
+- **Linter**: Use ``ruff`` for linting only (not formatting)
+- **Type hints**: Full type hints everywhere using modern syntax (``str | None``, ``list[str]``)
+- **Docstrings**: Vertical multi-line format only
+- **Imports**: Vertical multi-line for 2+ imports with trailing commas
+- **Constants**: All magic numbers and strings must be constants or enums
+
+Run formatters and linters
+---------------------------
+
+::
+
+    # Format code
+    yapf -ir src/
+
+    # Lint
+    ruff check src/
+
+    # Type check
+    mypy src/
+
+----
+
+Testing
+=======
+
+Run tests before submitting::
+
+    pytest -v
+
+----
+
+Pull Request Process
+====================
+
+1. Create a feature branch from ``main``
+2. Make your changes following code style guidelines
+3. Add tests for new functionality
+4. Ensure all tests pass
+5. Update documentation if needed
+6. Submit a pull request
+
+----
+
+Commit Messages
+===============
+
+Use conventional commit format:
+
+- ``feat:`` New features
+- ``fix:`` Bug fixes
+- ``docs:`` Documentation changes
+- ``refactor:`` Code refactoring
+- ``test:`` Test additions/changes
+- ``chore:`` Maintenance tasks
+
+Example::
+
+    feat: XYZ
+
+    - XYZ
+    - XYZ
+    - XYZ
+
+----
+
+Questions?
+==========
+
+Open an issue or reach out to the maintainers!