Create CONTRIBUTING.md with contribution guidelines

Added contributing guidelines for the project.

Author: Alexandrbig1

CONTRIBUTING.md

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+# Contributing Guidelines
+
+Thank you for considering contributing to **Open Code Chicago**!
+We welcome contributions of all skill levels.  
+
+## How to Contribute
+- Fork the repository and create a new branch
+- Make your changes and commit with clear messages
+- Open a Pull Request (PR) to the `main` branch
+- Reference any related issues in your PR
+
+## Guidelines
+- Follow our [Code of Conduct](./CODE_OF_CONDUCT.md)
+- Use clear, descriptive commit messages
+- Keep PRs focused on a single change (small & clear)
+- Write clean, well-documented code
+- If possible, include tests for new features
+
+## Issues
+- Use issues to report bugs, request features, or ask questions
+- Before opening a new issue, check if it already exists
+- Tag issues with labels (e.g., `bug`, `enhancement`, `good first issue`)
+
+## Getting Help
+If you’re stuck or unsure, feel free to:
+- Open a [Discussion](../../discussions)  
+- Reach out via our [Email](info@opencodechicago.org)
+
+Every contribution matters — big or small.