docs: Add CONTRIBUTING.md and CI badge (#1)

CONTRIBUTING.md

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+# Contributing to Agent Browser
+
+Thank you for your interest in contributing to Agent Browser! We welcome contributions from the community.
+
+## How to Contribute
+
+### 1. Set Up Development Environment
+- Ensure you have Node.js (v18+) and npm installed.
+- Clone the repository: `git clone https://github.com/dextonai/agent-browser.git`
+- Install dependencies: `npm install`
+
+### 2. Coding Guidelines
+- Follow the existing code style.
+- Use TypeScript for all new code.
+- Ensure all tests pass before submitting a PR.
+
+### 3. Submitting a Pull Request
+- Create a new branch for your feature or bug fix: `git checkout -b feature/your-feature-name`
+- Commit your changes with a descriptive message.
+- Push to your fork and submit a Pull Request to the `main` branch.
+- Reference any related issues in the PR description.
+
+## Bug Reports and Feature Requests
+Please use the GitHub Issues tracker to report bugs or suggest new features.

README.md

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