docs: add CONTRIBUTING.md guide

CONTRIBUTING.md

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+# Contributing to ai-trend-publish
+
+Thank you for contributing to ai-trend-publish!
+
+## Development Setup
+
+1. **Requirements**
+   - Node.js 18+ and pnpm
+   - A Telegram Bot Token (from @BotFather)
+   - API keys for content sources (optional)
+
+2. **Install dependencies**
+   ```bash
+   pnpm install
+   ```
+
+3. **Environment configuration**
+   ```bash
+   cp .env.example .env
+   # Edit .env with your Telegram bot token and API keys
+   ```
+
+4. **Run in development mode**
+   ```bash
+   pnpm dev
+   ```
+
+## Project Structure
+
+```
+ai-trend-publish/
+├── src/
+│   ├── bot/           # Telegram bot handlers
+│   ├── services/      # Content fetching and processing
+│   └── utils/         # Helper functions
+├── deno.json          # Deno configuration
+└── .env.example       # Environment variables template
+```
+
+## Making Changes
+
+1. **Create a feature branch**
+   ```bash
+   git checkout -b feat/your-feature-name
+   ```
+
+2. **Code style**
+   - Use TypeScript for all new code
+   - Run `pnpm lint` before committing
+   - Write self-documenting code
+
+3. **Test your changes**
+   ```bash
+   pnpm test
+   pnpm lint
+   ```
+
+4. **Commit and push**
+   ```bash
+   git commit -m "feat: add your feature"
+   git push origin feat/your-feature-name
+   ```
+
+## Pull Request Process
+
+1. Fork the repository
+2. Create your feature branch
+3. Make changes with adequate testing
+4. Submit a PR with clear description
+
+## Reporting Issues
+
+- Use GitHub Issues for bug reports
+- Include Node.js/Deno version
+- Include steps to reproduce
+
+## License
+
+By contributing, you agree your contributions are licensed under the project license.