docs: add CONTRIBUTING.md with setup, code style, and PR guidelines

CONTRIBUTING.md

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+# Contributing to Open-AutoGLM
+
+Thank you for your interest in contributing! Open-AutoGLM is a phone agent automation framework by Zhipu AI that enables LLM-based control of Android, HarmonyOS, and iOS devices.
+
+## Development Setup
+
+```bash
+git clone https://github.com/zai-org/Open-AutoGLM.git
+cd Open-AutoGLM
+pip install -e ".[dev]"
+```
+
+### Prerequisites
+- Python 3.10+
+- ADB (Android), HDC (HarmonyOS), or WebDriverAgent (iOS) depending on your target platform
+- An OpenAI-compatible API endpoint (e.g., AutoGLM-Phone-9B model)
+
+## Code Style
+
+We use pre-commit hooks to enforce code quality:
+
+```bash
+pip install pre-commit
+pre-commit install
+```
+
+This runs:
+- **ruff** for linting and formatting (PEP 8 compliant)
+- **ruff-format** for automatic code formatting
+- **typos** for spell checking
+- **pymarkdown** for Markdown linting
+
+All code and comments should be in English. Follow PEP 8 naming conventions.
+
+## Running Tests
+
+```bash
+pytest
+```
+
+Please ensure all tests pass before submitting a PR. If you add new functionality, include tests.
+
+## Pull Request Process
+
+1. Fork the repository and create a feature branch: `git checkout -b feature/my-feature`
+2. Make your changes, following the code style guidelines
+3. Add tests for any new functionality
+4. Ensure all tests pass: `pytest`
+5. Update documentation if needed
+6. Submit a pull request to the `main` branch
+
+### PR Title Format
+Use descriptive titles. Prefix with the area of change:
+- `fix:` for bug fixes
+- `feat:` for new features
+- `docs:` for documentation changes
+- `test:` for test additions
+- `refactor:` for code refactoring
+
+### PR Description
+Please include:
+- **What**: What does this PR do?
+- **Why**: Why is this change needed?
+- **How**: How was it implemented?
+- **Testing**: How was it tested?
+
+## Types of Contributions
+
+### Bug Fixes
+Check the [Issues](https://github.com/zai-org/Open-AutoGLM/issues) page for reported bugs. Issues tagged with `bug` are confirmed issues.
+
+### New Features
+For larger features, please open an issue first to discuss the design with maintainers.
+
+### Documentation
+We welcome documentation improvements! This includes:
+- Fixing typos or unclear explanations
+- Translating documentation (especially Chinese ↔ English)
+- Adding usage examples
+- Improving code docstrings
+
+### Tests
+We especially need tests! See [Issues tagged with testing needs](https://github.com/zai-org/Open-AutoGLM/issues) for areas that need coverage.
+
+## Adding Support for New Apps
+
+To add a new app to the agent's supported list:
+1. Add the app configuration in the appropriate platform directory
+2. Add the app to the prompts (both English and Chinese)
+3. Test with manual verification
+
+## Adding a New Action Type
+
+1. Add the action definition in `phone_agent/actions/handler.py`
+2. Update both `phone_agent/config/prompts.py` and `phone_agent/config/prompts_en.py`
+3. Add tests for the new action in `tests/`
+
+## Community
+
+- Report bugs via [GitHub Issues](https://github.com/zai-org/Open-AutoGLM/issues)
+- For questions, open a Discussion or comment on related Issues
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the Apache 2.0 License.