docs: add CONTRIBUTING.md to guide new contributors

CONTRIBUTING.md

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+# Contributing to CommitGPT
+## Hi there! 👋
+Thanks for your interest in contributing to CommitGPT — a tool to help developers write better commit messages using AI. Whether you're here to fix a bug, add a new feature, or improve documentation, you're very welcome! 🚀
+
+## Getting Started
+### 2. Clone your fork locally or use GitHub Codespaces.
+    git clone https://github.com/YOUR_USERNAME/commitgpt.git  
+    cd commitgpt
+### 3. Install dependencies
+    npm install
+### 4. Create a new branch
+    git checkout -b your-branch-name
+### 5. Make your changes!
+### 6. Commit your changes
+    git commit -m "feat: short description of your feature"
+### 7. Push your branch
+    git push origin your-branch-name
+### 8. Create a Pull Request on GitHub.
+_Please use a clear PR title and description, and link to any related issues._
+
+## What Can You Contribute?
+### Here are some great ways to help out:
+Bug fixes (see Issues)
+New features (CLI, AI prompts, integrations)
+UX improvements (especially for the CLI or VS Code extension)
+Add or improve tests
+Improve documentation (like this file!)
+Language/localization support
+Integrations with Git clients or other IDEs
+
+## Code Style
+### This project uses TypeScript and Prettier.
+Please run formatting and follow existing code style:
+    npm run format
+### Linting (if configured):
+    npm run lint
+
+## Questions or Help?
+### If you're not sure where to start:
+Look for issues labeled "good first issue"
+Open a new issue with your idea or question
+Or join the conversation in Discussions if available
+
+## License
+By contributing, you agree that your contributions will be licensed under the MIT License.
+
+# Thanks for helping improve CommitGPT! 🎉 Your contribution makes the developer experience better for thousands of users.