docs: add CONTRIBUTING.md and build status badge to README

CONTRIBUTING.md

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+# Contributing to agent-browser
+
+Thank you for your interest in improving `agent-browser`! We welcome contributions from everyone.
+
+## Getting Started
+
+1. **Fork the repository**: Create your own copy of the project.
+2. **Clone your fork**:
+   ```bash
+   git clone https://github.com/YOUR_USERNAME/agent-browser.git
+   ```
+3. **Install dependencies**:
+   Follow the instructions in the `README.md` to set up your development environment.
+
+## Contribution Process
+
+1. **Create a Branch**: Always create a new branch for your changes:
+   ```bash
+   git checkout -b feat/your-feature-name
+   ```
+2. **Make Changes**: Ensure your code follows the project's style guidelines.
+3. **Test Your Changes**: Run existing tests and add new ones if applicable.
+4. **Submit a Pull Request**:
+   - Provide a clear and descriptive title.
+   - Describe your changes and why they are necessary.
+   - Link the PR to an existing issue if applicable.
+
+## Coding Standards
+
+- Use clear and descriptive variable and function names.
+- Follow the established project structure.
+- Ensure all new features are documented in the `README.md` or relevant docs.
+
+## Communication
+
+If you have questions or want to discuss a feature, please open an issue or reach out to the maintainers.
+
+Happy coding! 🚀