docs: add CONTRIBUTING.md and build status badge

CONTRIBUTING.md

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+# Contributing to agent-browser
+
+Thank you for your interest in contributing to agent-browser! This guide will help you get started.
+
+## Development Setup
+
+### Prerequisites
+
+- **Node.js** 18+ (recommended: 20+)
+- **Rust** (latest stable, for native CLI development)
+- **Chrome/Chromium** (for testing browser automation)
+
+### Getting Started
+
+1. **Clone the repository:**
+   ```bash
+   git clone https://github.com/dextonai/agent-browser.git
+   cd agent-browser
+   ```
+
+2. **Install dependencies:**
+   ```bash
+   npm install
+   ```
+
+3. **Install the browser:**
+   ```bash
+   agent-browser install
+   ```
+
+4. **Build the native binary (if modifying Rust code):**
+   ```bash
+   cargo build --release
+   ```
+
+5. **Run tests:**
+   ```bash
+   npm test
+   ```
+
+## Coding Style Guidelines
+
+### JavaScript/TypeScript
+- Use **2 spaces** for indentation
+- Use **single quotes** for strings
+- Use **camelCase** for variables and functions
+- Use **PascalCase** for classes
+- Add JSDoc comments for public functions
+- Keep functions small and focused (< 50 lines)
+
+### Rust
+- Follow standard **Rust formatting** (`cargo fmt`)
+- Use `cargo clippy` to catch common issues
+- Document public APIs with `///` doc comments
+- Prefer `Result<T, E>` for error handling over `unwrap()`
+
+### General
+- Write clear commit messages following [Conventional Commits](https://www.conventionalcommits.org/):
+  - `feat: add new browser command`
+  - `fix: resolve timeout issue with slow pages`
+  - `docs: update README with installation steps`
+  - `chore: update dependencies`
+- Keep PRs small and focused (< 400 lines changed)
+- Include tests for new functionality
+
+## How to Submit a PR
+
+1. **Fork** the repository
+2. **Create a feature branch:**
+   ```bash
+   git checkout -b feat/your-feature-name
+   ```
+3. **Make your changes** and commit with clear messages
+4. **Test your changes:**
+   ```bash
+   npm test
+   cargo test  # if modifying Rust code
+   ```
+5. **Push to your fork:**
+   ```bash
+   git push origin feat/your-feature-name
+   ```
+6. **Open a Pull Request** against the `main` branch
+   - Include a clear description of what the PR does
+   - Reference any related issues
+   - Add screenshots for UI changes
+
+## Reporting Issues
+
+- Use [GitHub Issues](https://github.com/dextonai/agent-browser/issues)
+- Include:
+  - Steps to reproduce
+  - Expected vs actual behavior
+  - Your OS and Node.js version
+  - Any error messages or logs
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the same license as the project.

README.md

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 # agent-browser
 
+[![Build Status](https://github.com/dextonai/agent-browser/actions/workflows/ci.yml/badge.svg)](https://github.com/dextonai/agent-browser/actions)
+
 Browser automation CLI for AI agents. Fast native Rust CLI.
 
 ## Installation