docs: add CONTRIBUTING.md and CI badge

CONTRIBUTING.md

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+# Contributing to agent-browser
+
+Thank you for your interest in contributing to agent-browser! This document provides guidelines and instructions for contributing.
+
+## Development Setup
+
+### Prerequisites
+
+- Node.js 20 or later
+- pnpm 9 or later
+- Rust (for native CLI builds) - optional but recommended
+
+### Installation
+
+1. Fork the repository
+2. Clone your fork:
+   ```bash
+   git clone https://github.com/YOUR_USERNAME/agent-browser.git
+   cd agent-browser
+   ```
+3. Install dependencies:
+   ```bash
+   pnpm install
+   ```
+4. Build the project:
+   ```bash
+   pnpm build
+   ```
+
+## Coding Style
+
+- Use TypeScript for all new code
+- Follow the existing code style
+- Run ```pnpm format``` to format your code with Prettier
+- Run ```pnpm typecheck``` to check for type errors
+
+## Submitting a Pull Request
+
+1. Create a new branch for your changes:
+   ```bash
+   git checkout -b feature/your-feature-name
+   ```
+2. Make your changes and commit them with clear messages
+3. Push your branch to your fork
+4. Open a pull request against the main branch
+5. Ensure all CI checks pass
+
+## Running Tests
+
+```bash
+pnpm test
+```
+
+## Questions?
+
+Feel free to open an issue for any questions or discussions.