Add CONTRIBUTING.md for issue #17

CONTRIBUTING.md

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+# Contributing Guidelines
+
+Thank you for your interest in contributing to this project! We welcome contributions from the community. Please read the following guidelines to help us maintain a high standard and streamline the contribution process.
+
+## How to Contribute
+
+1. **Fork the Repository**
+
+   - Click the 'Fork' button at the top right of this repository page to create your own copy.
+
+2. **Clone Your Fork**
+
+   - Clone your forked repository to your local machine:
+     ```bash
+     git clone https://github.com/<your-username>/ElixirV3.git
+     cd ElixirV3
+     ```
+
+3. **Create a New Branch**
+
+   - Create a branch for your feature or bugfix:
+     ```bash
+     git checkout -b <branch-name>
+     ```
+
+4. **Make Your Changes**
+
+   - Make your changes or additions. Please ensure your code follows the existing style and conventions.
+
+5. **Test Your Changes**
+
+   - Run the application and ensure your changes work as expected and do not break existing functionality.
+
+6. **Commit Your Changes**
+
+   - Use clear and descriptive commit messages. Follow the commit message format below.
+
+7. **Push to Your Fork**
+
+   - Push your branch to your forked repository:
+     ```bash
+     git push origin <branch-name>
+     ```
+
+8. **Open a Pull Request**
+   - Go to the original repository and open a pull request. Provide a clear description of your changes and reference any related issues.
+
+## Commit Message Format
+
+```
+<TEAM> | <type>(<scope>): <description>
+```
+
+### Examples
+
+```
+GFG | feat(event): new card designs
+GFG | fix(event): api request improve
+GFG | chore(event): title copy change
+GFG | refactor(event): mentor's search logic
+
+ELX | feat(event): new card designs
+GDG | fix(event): api request improve
+CC | chore(event): title copy change
+```
+
+- `<TEAM>`: Team code. If you are a member of one of the Elixir clubs, use your club's code:
+
+  - `GFG` for GeeksforGeeks ABESEC
+  - `GDG` for Google Developer Group ABESEC
+  - `CC` for CodeChef ABESEC
+  - `ELX` for external contributers
+
+- `<type>`: Type of change (feat, fix, chore, refactor, etc.)
+- `<scope>`: Area affected (e.g., event)
+- `<description>`: Short summary of the change
+
+## Code Style & Standards
+
+- Follow the existing code style and formatting.
+- Write clear, concise, and well-documented code.
+- Add comments where necessary, especially for complex logic.
+- Write tests for new features or bug fixes if applicable.
+
+## Community Standards
+
+- Be respectful and inclusive in all interactions.
+- Provide constructive feedback in code reviews.
+- Report issues or bugs using the issue tracker.
+
+## Need Help?
+
+If you have any questions or need guidance, feel free to open an issue or reach out to the maintainers.
+
+Thank you for contributing!