docs: add CONTRIBUTING.md and SECURITY.md

CONTRIBUTING.md

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+# Contributing to grok2api
+
+Thank you for contributing to grok2api!
+
+## Development Setup
+
+1. **Requirements**
+   - Python 3.10+
+   - FastAPI
+   - Docker (optional, for containerized deployment)
+
+2. **Clone and install**
+   ```bash
+   git clone https://github.com/chenyme/grok2api.git
+   cd grok2api
+   pip install -e .
+   ```
+
+3. **Configuration**
+   ```bash
+   cp .env.example .env
+   # Edit .env with your API keys
+   ```
+
+4. **Run the server**
+   ```bash
+   uvicorn main:app --reload
+   # or
+   python -m grok2api
+   ```
+
+## Project Structure
+
+```
+grok2api/
+├── app/                 # Main application
+│   ├── api/             # API routes
+│   ├── core/            # Core logic
+│   └── models/          # Data models
+├── tests/               # Test suite
+├── docker/              # Docker configuration
+└── docs/                # Documentation
+```
+
+## Making Changes
+
+1. **Create a branch**
+   ```bash
+   git checkout -b feat/your-feature
+   ```
+
+2. **Code style**
+   - Follow PEP 8
+   - Use type hints
+   - Add docstrings
+
+3. **Test**
+   ```bash
+   pytest tests/
+   ```
+
+4. **Commit and push**
+   ```bash
+   git commit -m "feat: description"
+   git push
+   ```
+
+## Pull Request Process
+
+1. Fork the repository
+2. Create feature branch
+3. Make changes with tests
+4. Submit PR with description
+
+## Security
+
+If you find a security vulnerability, please see SECURITY.md for reporting instructions.
+
+## License
+
+By contributing, you agree your contributions are licensed under the project license.