Add contributing guidelines for HKN website

CONTRIBUTING.md

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+# Contributing to HKN Website
+
+Thank you for your interest in contributing to the HKN (IEEE-Eta Kappa Nu) Berkeley Mu Chapter website! We welcome contributions from everyone.
+
+## Table of Contents
+
+- [Getting Started](#getting-started)
+- [How to Contribute](#how-to-contribute)
+- [Development Workflow](#development-workflow)
+- [Code Style Guidelines](#code-style-guidelines)
+- [Submitting a Pull Request](#submitting-a-pull-request)
+- [Reporting Issues](#reporting-issues)
+- [Communication](#communication)
+
+## Getting Started
+
+Before you begin contributing, please:
+
+1. Read the [README.md](README.md) to understand the project structure and setup instructions
+2. Set up your local development environment following the setup guide
+3. Look for issues labeled with `good first issue` if you're new to the project
+
+## How to Contribute
+
+There are several ways you can contribute to this project:
+
+### Code Contributions
+
+- Fix bugs or implement new features
+- Improve existing functionality
+- Write or update tests
+- Optimize performance
+
+### Documentation
+
+- Improve existing documentation
+- Add missing documentation
+- Fix typos or clarify confusing sections
+- Create tutorials or guides
+
+### Testing
+
+- Report bugs
+- Test new features
+- Verify bug fixes
+
+## Development Workflow
+
+### 1. Fork and Clone
+
+Fork the repository and clone it to your local machine:
+
+```bash
+git clone https://github.com/YOUR-USERNAME/hknweb.git
+cd hknweb
+```
+
+### 2. Create a Branch
+
+Create a new branch for your work:
+
+```bash
+git checkout -b feature/your-feature-name
+```
+
+Or for bug fixes:
+
+```bash
+git checkout -b fix/issue-description
+```
+
+### 3. Set Up Development Environment
+
+Follow the setup instructions in the README.md:
+
+```bash
+# Install Poetry
+pipx install poetry
+
+# Install dependencies
+poetry install
+
+# Activate virtual environment
+poetry shell
+
+# Apply migrations
+python manage.py migrate
+
+# Run the development server
+python manage.py runserver
+```
+
+### 4. Make Your Changes
+
+- Write clean, readable code
+- Follow the existing code style
+- Add comments where necessary
+- Update documentation if needed
+
+### 5. Test Your Changes
+
+Before submitting, make sure:
+
+- Your code works as expected
+- You haven't broken any existing functionality
+- All tests pass (if applicable)
+- The development server runs without errors
+
+### 6. Commit Your Changes
+
+Write clear, descriptive commit messages:
+
+```bash
+git add .
+git commit -m "Add feature: brief description of what you did"
+```
+
+Good commit message examples:
+- `Fix: Resolve login authentication bug`
+- `Add: Implement event calendar filtering`
+- `Update: Improve README setup instructions`
+- `Docs: Add Docker setup documentation`
+
+### 7. Push to Your Fork
+
+```bash
+git push origin feature/your-feature-name
+```
+
+## Code Style Guidelines
+
+### Python Code
+
+- Follow PEP 8 style guidelines
+- Use meaningful variable and function names
+- Keep functions small and focused
+- Add docstrings to functions and classes
+- Use type hints where appropriate
+
+### Django Best Practices
+
+- Follow Django's coding conventions
+- Use Django's built-in features when possible
+- Write database queries efficiently
+- Keep views, models, and templates organized
+
+### HTML/CSS/JavaScript
+
+- Use semantic HTML
+- Keep CSS organized and modular
+- Follow Vue.js best practices for frontend code
+- Ensure responsive design
+
+## Submitting a Pull Request
+
+1. **Push your changes** to your forked repository
+2. **Create a Pull Request** from your branch to the `master` branch of the main repository
+3. **Fill out the PR template** with:
+   - Clear description of what changes you made
+   - Why these changes are necessary
+   - Any related issue numbers (e.g., "Fixes #123")
+   - Screenshots (if applicable)
+4. **Wait for review** - A maintainer will review your PR and may request changes
+5. **Make requested changes** if needed
+6. **Get merged** - Once approved, your PR will be merged!
+
+### PR Title Guidelines
+
+Use clear, descriptive titles:
+- `Fix: Resolve event calendar display bug`
+- `Feature: Add user profile editing`
+- `Docs: Update contribution guidelines`
+- `Refactor: Improve database query performance`
+
+## Reporting Issues
+
+If you find a bug or have a feature request:
+
+1. **Check existing issues** to avoid duplicates
+2. **Use the issue template** if available
+3. **Provide detailed information:**
+   - Clear title and description
+   - Steps to reproduce (for bugs)
+   - Expected vs actual behavior
+   - Screenshots or error messages
+   - Your environment (OS, Python version, etc.)
+
+## Communication
+
+- Be respectful and constructive
+- Ask questions if you're unsure
+- Provide feedback on others' contributions
+- Help review pull requests
+
+## Need Help?
+
+If you need assistance:
+- Check the [README.md](README.md) first
+- Look through existing issues and pull requests
+- Ask questions in your issue or PR
+- Reach out to project maintainers
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the same [MIT License](LICENSE) that covers this project.
+
+Thank you for contributing to the HKN website! 🎉