Add CONTRIBUTING.md and README badge

CONTRIBUTING.md

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+# Contributing to agent-browser
+
+Thank you for your interest in contributing! This document provides guidelines and instructions for contributing.
+
+## Getting Started
+
+1. Fork the repository
+2. Clone your fork: `git clone https://github.com/YOUR_USERNAME/agent-browser.git`
+3. Install dependencies: `pnpm install`
+4. Build the project: `pnpm build`
+
+## Development Setup
+
+### Prerequisites
+
+- Node.js 18+
+- pnpm
+- Rust (for native builds)
+
+### Setup
+
+1. Install dependencies:
+   ```bash
+   pnpm install
+   ```
+
+2. Build the project:
+   ```bash
+   pnpm build
+   ```
+
+3. Run tests:
+   ```bash
+   pnpm test
+   ```
+
+## Pull Request Guidelines
+
+1. Keep PRs focused on a single change
+2. Write clear commit messages
+3. Include tests for new features
+4. Update documentation as needed
+5. Ensure all tests pass before submitting
+
+## Code Style
+
+- Follow the existing code style
+- Use Prettier for formatting
+- Run `pnpm lint` to check for linting issues
+- Write meaningful variable and function names
+
+## Reporting Issues
+
+- Use the issue tracker
+- Include reproduction steps
+- Include error messages and logs
+- Specify your environment (OS, Node.js version)
+
+## Questions?
+
+Feel free to ask questions in the issues or discussions.