docs: add CONTRIBUTING.md and CI badge to README

CONTRIBUTING.md

@@ -0,0 +1,103 @@
+# Contributing to agent-browser
+
+Thanks for your interest in contributing! This guide covers everything you need to get started.
+
+## Development Setup
+
+### Prerequisites
+
+- [Node.js](https://nodejs.org/) v20 or v22
+- [pnpm](https://pnpm.io/) v9+
+- [Rust](https://rustup.rs/) (stable toolchain)
+- [Playwright](https://playwright.dev/) (installed automatically via pnpm)
+
+### Clone & Install
+
+```bash
+git clone https://github.com/dextonai/agent-browser.git
+cd agent-browser
+pnpm install
+```
+
+### Build
+
+```bash
+# Build TypeScript
+pnpm build
+
+# Build Rust CLI
+cargo build --release --manifest-path cli/Cargo.toml
+```
+
+### Run Tests
+
+```bash
+# TypeScript tests
+pnpm test
+
+# Rust tests
+cargo test --manifest-path cli/Cargo.toml
+
+# Type checking
+pnpm typecheck
+
+# Format check
+pnpm format:check
+```
+
+## Coding Style
+
+### TypeScript
+
+- Follow the existing code style enforced by [Prettier](https://prettier.io/)
+- Run `pnpm format:check` before committing
+- Use strict TypeScript — no `any` unless absolutely necessary
+
+### Rust
+
+- Follow `rustfmt` defaults (configured in `.rustfmt.toml`)
+- Run `cargo fmt --check` and `cargo clippy` before committing
+
+## Submitting a PR
+
+1. **Fork** the repository and create a branch from `main`:
+   ```bash
+   git checkout -b feat/your-feature
+   ```
+
+2. **Make your changes** and ensure all checks pass:
+   ```bash
+   pnpm typecheck
+   pnpm format:check
+   pnpm test
+   cargo test --manifest-path cli/Cargo.toml
+   ```
+
+3. **Commit** with a clear, descriptive message:
+   ```bash
+   git commit -m "feat: add support for XYZ"
+   ```
+
+4. **Push** and open a Pull Request against `main`.
+
+5. **Fill out the PR template** — describe what changed and why.
+
+### PR Guidelines
+
+- Keep PRs focused — one feature or fix per PR
+- Add tests for new functionality
+- Update documentation if behavior changes
+- Ensure CI passes before requesting review
+
+## Reporting Issues
+
+Open an issue on [GitHub Issues](https://github.com/dextonai/agent-browser/issues) with:
+
+- A clear title and description
+- Steps to reproduce (if a bug)
+- Expected vs actual behavior
+- Environment details (OS, Node version, Rust version)
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the same license as the project.

README.md

@@ -1,5 +1,7 @@
 # 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