Create CONTRIBUTING.md

Author: ajay-dhangar

CONTRIBUTING.md

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+# 🤝 Contributing to CodeHarborHub Coding Platform
+
+Welcome! 🎉 We’re thrilled that you’d like to contribute to this open-source coding platform. Whether you're fixing bugs, adding new features, or improving documentation — you're helping thousands of developers grow!
+
+---
+
+## 📦 Local Setup
+
+1. **Fork the repo** and clone your fork:
+   ```bash
+   git clone https://github.com/YOUR_USERNAME/ccoding-platform.git
+   cd coding-platform
+   ```
+
+2. **Install dependencies**:
+
+   ```bash
+   npm install
+   ```
+
+3. **Start development server**:
+
+   ```bash
+   npm run dev
+   ```
+
+---
+
+## 🛠️ How to Contribute
+
+### ✅ Bug Fixes / Feature Requests
+
+* Open an [issue](https://github.com/codeharborhub/coding-platform/issues/new) first
+* Use good commit messages (`feat`, `fix`, `chore`, ...)
+* Follow our coding style and naming conventions
+
+### ✅ Pull Request Process
+
+1. Create a new branch:
+
+   ```bash
+   git checkout -b fix/your-feature-name
+   ```
+
+2. Make your changes. Test thoroughly.
+
+3. Commit your changes:
+
+   ```bash
+   git commit -m "fix: fixed hint dropdown overflow issue"
+   ```
+
+4. Push and submit PR:
+
+   ```bash
+   git push origin fix/your-feature-name
+   ```
+
+5. Submit a [Pull Request](https://github.com/codeharborhub/coding-platform/pulls) and link the issue.
+
+---
+
+## 🌐 Code Style
+
+* Use **React functional components**
+* Follow **ESLint rules**
+* Use **Tailwind CSS** for styling
+* Use **PascalCase** for components, **camelCase** for variables
+
+---
+
+## 🤖 Project Structure
+
+```
+src/
+┣ components/         # Reusable UI components
+┣ pages/              # Route-based pages
+┣ data/               # Problem metadata
+┣ utils/              # Helper functions
+┣ assets/             # Images/icons
+```
+
+---
+
+## 💡 Suggestions
+
+Have a cool idea? We’re listening!
+Start a [discussion](https://github.com/codeharborhub/coding-platform/discussions) or open an issue.
+
+---
+
+## 🧑‍💻 Contributor Credits
+
+Your name will be listed in the [Contributors tab](https://github.com/codeharborhub/coding-platform/graphs/contributors) when your PR is merged. Thank you! 🙌
+
+---
+
+Built with ❤️ by [Ajay Dhangar](https://github.com/ajay-dhangar)