docs: add CONTRIBUTING.md and CI status badge

CONTRIBUTING.md

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+# Contributing to agent-browser
+
+Thanks for your interest in contributing! This guide will help you get started.
+
+## Development Setup
+
+### Prerequisites
+
+- [Node.js](https://nodejs.org/) (LTS recommended)
+- [pnpm](https://pnpm.io/) (`npm install -g pnpm`)
+- [Rust](https://rustup.rs/) (optional, for building the native CLI)
+
+### Clone and Install
+
+```bash
+git clone https://github.com/dextonai/agent-browser.git
+cd agent-browser
+pnpm install
+```
+
+### Build
+
+```bash
+pnpm build            # Build the Node.js package
+pnpm build:native     # Build the native Rust CLI (requires Rust toolchain)
+```
+
+### Run Tests
+
+```bash
+pnpm test             # Run the test suite
+```
+
+### Link Locally for Testing
+
+```bash
+pnpm link --global    # Makes `agent-browser` available globally from your local build
+agent-browser install  # Download Chromium for testing
+```
+
+## Coding Style
+
+- **TypeScript**: Follow the existing code style. Use `eslint` and `prettier` configurations provided in the repo.
+- **Rust**: Use `cargo fmt` and `cargo clippy` before submitting.
+- **Naming**: Use descriptive names. Prefer clarity over brevity.
+- **Comments**: Add comments for non-obvious logic. Avoid commenting obvious code.
+- **Error handling**: Always handle errors explicitly. Avoid silent failures.
+
+### Linting
+
+```bash
+pnpm lint             # Check for lint issues
+pnpm lint --fix       # Auto-fix where possible
+```
+
+### Formatting
+
+```bash
+pnpm format           # Run prettier
+```
+
+## How to Submit a PR
+
+1. **Fork** the repository and create a new branch from `main`:
+
+   ```bash
+   git checkout -b feat/my-feature
+   ```
+
+2. **Make your changes.** Keep commits focused and atomic.
+
+3. **Run tests and lint** before committing:
+
+   ```bash
+   pnpm test
+   pnpm lint
+   ```
+
+4. **Commit** with a clear, descriptive message:
+
+   ```bash
+   git commit -m "feat: add snapshot diff command"
+   ```
+
+   We follow [Conventional Commits](https://www.conventionalcommits.org/):
+   - `feat:` for new features
+   - `fix:` for bug fixes
+   - `docs:` for documentation changes
+   - `refactor:` for code refactoring
+   - `test:` for adding or updating tests
+   - `chore:` for maintenance tasks
+
+5. **Push** your branch and open a Pull Request against `main`.
+
+6. **Fill in the PR template** with:
+   - A clear description of what the PR does
+   - Any related issues (e.g., `Closes #123`)
+   - Screenshots or examples if applicable
+
+7. **Wait for CI** to pass. Fix any failures before requesting review.
+
+## Reporting Issues
+
+- Use [GitHub Issues](https://github.com/dextonai/agent-browser/issues) to report bugs or request features.
+- Include steps to reproduce, expected behavior, and actual behavior.
+- Mention your OS, Node.js version, and agent-browser version.
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the [Apache-2.0 License](LICENSE).

README.md

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 # agent-browser
 
+[![CI](https://github.com/dextonai/agent-browser/actions/workflows/ci.yml/badge.svg)](https://github.com/dextonai/agent-browser/actions/workflows/ci.yml)
+
 Headless browser automation CLI for AI agents. Fast Rust CLI with Node.js fallback.
 
 ## Installation