docs: add README badge and CONTRIBUTING.md (Closes #1)

CONTRIBUTING.md

@@ -0,0 +1,133 @@
+# Contributing to agent-browser
+
+Thank you for your interest in contributing to agent-browser!
+
+## Development Setup
+
+### Prerequisites
+
+- Node.js 18+
+- npm or pnpm
+- Rust (for native binary, optional)
+
+### Quick Start
+
+```bash
+# Clone the repository
+git clone https://github.com/vercel-labs/agent-browser
+cd agent-browser
+
+# Install dependencies
+pnpm install
+
+# Build everything (Node.js + Rust native binary)
+pnpm build
+
+# Link globally for testing
+pnpm link --global
+
+# Install Chromium
+agent-browser install
+```
+
+### Build Commands
+
+| Command | Description |
+|---------|-------------|
+| `pnpm build` | Build Node.js package |
+| `pnpm build:native` | Build Rust native binary (requires Rust) |
+| `pnpm build:all` | Build both |
+| `pnpm lint` | Run ESLint |
+| `pnpm test` | Run tests |
+
+### Environment Variables
+
+For development, you can set these to override defaults:
+
+```bash
+export AGENT_BROWSER_EXECUTABLE_PATH=/path/to/chromium
+export AGENT_BROWSER_HEADLESS=false  # See browser while testing
+```
+
+## Coding Style
+
+- Use **camelCase** for variables and functions
+- Use **PascalCase** for classes and types
+- Use **kebab-case** for file names
+- Prefer `async/await` over raw Promises
+- Always handle errors explicitly
+- Add TypeScript types for all function parameters
+
+## Project Structure
+
+```
+src/
+  cli/          # CLI argument parsing
+  commands/     # Individual command implementations
+  browser/      # Browser management (Playwright wrapper)
+  native/       # Native Rust CLI bridge
+  types/        # TypeScript type definitions
+```
+
+## Submitting Changes
+
+### 1. Fork and Create a Branch
+
+```bash
+git checkout -b feat/my-new-feature
+# or
+git checkout -b fix/my-bug-fix
+```
+
+### 2. Make Your Changes
+
+- Write code following the style guide above
+- Add or update tests as needed
+- Update documentation if behavior changed
+
+### 3. Test Your Changes
+
+```bash
+pnpm build
+pnpm lint
+pnpm test
+
+# Manual test
+agent-browser open https://example.com
+agent-browser snapshot
+agent-browser close
+```
+
+### 4. Submit a Pull Request
+
+- Fill out the PR template completely
+- Reference any related issues
+- Ensure CI passes
+- One approval required to merge
+
+## Reporting Bugs
+
+When reporting bugs, include:
+
+- `agent-browser` version (`agent-browser --version`)
+- Platform (macOS/Linux/Windows)
+- Steps to reproduce
+- Expected vs actual behavior
+- Error messages or screenshots
+
+## Suggesting Features
+
+Open an issue with:
+
+- Clear problem you're trying to solve
+- Proposed solution
+- Example use case
+- Any relevant links or references
+
+## Code of Conduct
+
+Be respectful and constructive. We follow the [Contributor Covenant](https://www.contributor-covenant.org/).
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the Apache-2.0 license.

README.md

@@ -1,5 +1,7 @@
 # agent-browser
 
+[![Build](https://github.com/vercel-labs/agent-browser/actions/workflows/ci.yml/badge.svg)](https://github.com/vercel-labs/agent-browser/actions/workflows/ci.yml)
+
 Headless browser automation CLI for AI agents. Fast Rust CLI with Node.js fallback.
 
 ## Installation