Adding a readme to the root of cookbooks

cookbook/README.md

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+# GitHub Copilot Cookbook
+
+A collection of practical recipes and examples for working with GitHub Copilot tools and features. Each recipe provides focused, copy-paste-ready code snippets and real-world examples to help you accomplish common tasks.
+
+## What's in the Cookbook
+
+The cookbook is organized by tool or product, with recipes collected by language where applicable:
+
+### GitHub Copilot SDK
+
+Ready-to-use recipes for building with the GitHub Copilot SDK across multiple languages.
+
+- **[Copilot SDK Cookbook](copilot-sdk/)** - Recipes for .NET, Go, Node.js, and Python
+  - Error handling, session management, file operations, and more
+  - Runnable examples for each language
+  - Best practices and complete implementation guides
+
+## Getting Started
+
+1. Browse the tool or product folder that matches what you want to build
+2. Find the recipe that solves your use case
+3. Copy the code snippet or check the `recipe/` subfolder for complete, runnable examples
+4. Refer to the language-specific documentation for setup and execution instructions
+
+## Planned Expansions
+
+The cookbook is designed to grow alongside the GitHub Copilot ecosystem. Future additions may include recipes for:
+
+- Additional Copilot tools and integrations
+- Advanced patterns and workflows
+- Integration with external services and APIs
+- Language-specific optimizations and best practices
+
+## Contributing
+
+Have a recipe to share? We'd love to include it! See [CONTRIBUTING.md](../CONTRIBUTING.md) for guidelines on submitting new recipes.
+
+## Resources
+
+### Official Documentation
+
+- [GitHub Copilot Documentation](https://docs.github.com/copilot)
+- [GitHub Copilot SDK](https://github.com/github/copilot-sdk)
+
+### External Cookbooks
+
+- [Microsoft Copilot Adventures](https://github.com/microsoft/CopilotAdventures) - Interactive adventures and tutorials for learning GitHub Copilot
+- [GitHub Copilot Chat Cookbook](https://docs.github.com/en/copilot/tutorials/copilot-chat-cookbook) - Official cookbook with Copilot Chat examples and techniques
+
+### Other
+
+- [Main Repository](../)