Initialized openttd-client repo

docs/CONTRIBUTING.md

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+# Contributing to OpenTTD Python Client
+
+We welcome contributions from the community! To maintain the high quality of this library, please follow these guidelines.
+
+## Code Standards
+- **Clean OO Code:** Logic must be encapsulated within the `OpenTTDClient` or `OpenTTDProtocol` classes.
+- **Type Safety:** Use type hints where possible.
+- **Minimal Dependencies:** Only add new dependencies if absolutely necessary.
+
+## Testing Mandate
+We enforce **100% test coverage**. Any new feature or bug fix must include corresponding tests.
+
+### Running Tests
+Use `pytest` within the virtual environment:
+```bash
+PYTHONPATH=lib ./venv/bin/pytest --cov=openttd --cov-report=term-missing tests/
+```
+
+### Types of Tests
+- **Logic Tests (`tests/test_logic.py`):** High-level client state and API behavior.
+- **Protocol Tests (`tests/test_protocol.py`):** Low-level binary parsing and encryption.
+- **E2E Tests (`tests/test_e2e.py`):** Integration tests against a live server.
+
+## Submitting Changes
+1.  **Fork the repo** and create your branch from `main`.
+2.  **Add tests** for your changes.
+3.  **Run the full test suite** to ensure no regressions and verify 100% coverage.
+4.  **Open a Pull Request** with a detailed description of your changes.