docs: Add README badge and CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to agent-browser
+
+Thank you for your interest in contributing! This guide will help you get started.
+
+## Development Setup
+
+### Prerequisites
+
+- [Node.js](https://nodejs.org/) 18+ (for npm/pnpm)
+- [Rust](https://rustup.rs/) (for native binary build)
+- [Chromium](https://www.chromium.org/) (for browser automation)
+
+### Installation
+
+```bash
+# Clone the repository
+git clone https://github.com/vercel-labs/agent-browser
+cd agent-browser
+
+# Install dependencies
+pnpm install
+
+# Build the project
+pnpm build
+
+# Build native Rust binary (requires Rust toolchain)
+pnpm build:native
+
+# Link globally for CLI use
+pnpm link --global
+
+# Download Chromium browser
+agent-browser install
+# or on Linux with system deps:
+agent-browser install --with-deps
+```
+
+### Running Tests
+
+```bash
+pnpm test
+```
+
+### Code Style
+
+- Use **TypeScript** for Node.js/JavaScript code
+- Use **Rust** for performance-critical native code
+- Run `pnpm lint` before committing
+- Follow existing patterns in the codebase
+
+## Submitting a PR
+
+1. **Fork** the repository and create a branch from `main`:
+   ```bash
+   git checkout -b feat/your-feature-name
+   ```
+
+2. **Make your changes** — ensure all tests pass:
+   ```bash
+   pnpm test
+   pnpm lint
+   ```
+
+3. **Commit** with a clear message:
+   ```bash
+   git commit -m "feat: add support for new selector type"
+   ```
+
+4. **Push** to your fork:
+   ```bash
+   git push origin feat/your-feature-name
+   ```
+
+5. **Open a Pull Request** — reference the issue number if applicable:
+   ```bash
+   gh pr create --fill
+   ```
+
+## Code Review Process
+
+- Maintainers will review your PR as soon as possible
+- Address any feedback by pushing new commits to the same branch
+- Once approved, your PR will be merged
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the Apache License 2.0.

README.md

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