Add CONTRIBUTING.md file with comprehensive contribution guidelines

CONTRIBUTING.md

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+# Contributing to Hacktoberfest2025
+
+Thank you for considering contributing to this project! We welcome contributions from everyone.
+
+## How to Contribute
+
+### 1. Choose an Issue
+- Browse the [Issues](https://github.com/fineanmol/Hacktoberfest2025/issues) page
+- Look for issues labeled `good first issue` or `hacktoberfest`
+- Comment on the issue to indicate you're working on it
+- Wait for maintainer approval before starting work
+
+### 2. Fork and Clone
+```bash
+# Fork the repository on GitHub
+# Then clone your fork
+git clone https://github.com/YOUR-USERNAME/Hacktoberfest2025.git
+cd Hacktoberfest2025
+```
+
+### 3. Create a Branch
+```bash
+git checkout -b feature/your-feature-name
+```
+
+### 4. Make Your Changes
+- Write clean, readable code
+- Add comments to explain complex logic
+- Test your changes thoroughly
+- Follow existing code style and structure
+
+### 5. Commit Your Changes
+```bash
+git add .
+git commit -m "Add: Brief description of your changes"
+```
+
+Use clear commit messages:
+- `Add:` for new features
+- `Fix:` for bug fixes
+- `Update:` for improvements to existing code
+- `Docs:` for documentation changes
+
+### 6. Push and Create Pull Request
+```bash
+git push origin feature/your-feature-name
+```
+
+Then create a pull request on GitHub with:
+- A clear title describing your changes
+- Reference to the related issue (e.g., "Fixes #123")
+- Description of what you've changed and why
+
+## Code Guidelines
+
+### General
+- Use descriptive variable and function names
+- Add comments for complex algorithms
+- Keep functions small and focused
+- Remove unused code and imports
+
+### Language-Specific
+
+**C/C++:**
+- Use standard library headers instead of `#include <bits/stdc++.h>`
+- Add header guards in .h files
+- Use consistent indentation (2 or 4 spaces)
+
+**Python:**
+- Follow PEP 8 style guide
+- Add docstrings to functions and classes
+- Use meaningful variable names
+
+**JavaScript:**
+- Use `const` and `let` instead of `var`
+- Add JSDoc comments for functions
+- Follow consistent formatting
+
+## What We Look For
+
+✅ Clean, well-documented code  
+✅ Proper error handling  
+✅ Following existing code patterns  
+✅ Testing your changes  
+✅ One feature/fix per pull request  
+
+❌ Spam pull requests  
+❌ Low-quality or incomplete code  
+❌ Changes without related issues  
+❌ Formatting-only changes without substance  
+
+## Getting Help
+
+- Join discussions in issue comments
+- Ask questions before starting work
+- Be respectful and patient
+
+## Code of Conduct
+
+- Be respectful to all contributors
+- Provide constructive feedback
+- Focus on the code, not the person
+- Help create a welcoming environment
+
+Thank you for contributing! 🎉