docs: Add comprehensive CONTRIBUTING.md guide

CONTRIBUTING.md

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+# Contributing to RustChain
+
+Thank you for your interest in contributing to RustChain! This document provides guidelines for contributing to the project.
+
+## 🎯 Ways to Contribute
+
+### Code Contributions
+- **Bug fixes**: Find and fix issues in the codebase
+- **Features**: Implement new features or improvements
+- **Documentation**: Improve or add documentation
+- **Tests**: Add test coverage for existing code
+- **Refactoring**: Improve code quality and maintainability
+
+### Non-Code Contributions
+- **Bug reports**: Report issues you encounter
+- **Feature requests**: Suggest new features or improvements
+- **Documentation feedback**: Help improve the documentation
+- **Community support**: Help others in issues and discussions
+
+## 🏆 Bounty Program
+
+RustChain offers bounties for contributions! Check out:
+- [Open bounty issues](https://github.com/Scottcjn/Rustchain/labels/bounty)
+- [First contribution bounty](https://github.com/Scottcjn/Rustchain/issues/48) - Earn 10 RTC for your first merged PR!
+
+## 🚀 Getting Started
+
+### 1. Fork and Clone
+```bash
+# Fork the repository on GitHub, then:
+git clone https://github.com/YOUR_USERNAME/Rustchain.git
+cd Rustchain
+```
+
+### 2. Create a Branch
+```bash
+git checkout -b feature/your-feature-name
+# or
+git checkout -b fix/your-bug-fix
+```
+
+### 3. Make Your Changes
+- Follow the existing code style
+- Add comments for complex logic
+- Update documentation if needed
+- Test your changes against the live network
+
+### 4. Test Your Changes
+```bash
+# Test against the live network
+curl -sk https://50.28.86.131/health
+
+# For miner changes, test with:
+python3 miners/linux/rustchain_linux_miner.py --wallet test-wallet --dry-run
+```
+
+### 5. Commit Your Changes
+```bash
+git add .
+git commit -m "type: brief description of changes"
+```
+
+**Commit message format:**
+- `feat:` for new features
+- `fix:` for bug fixes
+- `docs:` for documentation changes
+- `refactor:` for code refactoring
+- `test:` for adding tests
+- `chore:` for maintenance tasks
+
+### 6. Push and Create PR
+```bash
+git push origin feature/your-feature-name
+```
+
+Then create a Pull Request on GitHub with:
+- **Clear title** describing the change
+- **Description** explaining what and why
+- **Reference** to any related issues (e.g., "Closes #123")
+- **Testing evidence** if applicable
+
+## 📋 Code Guidelines
+
+### Python Code Style
+- Follow [PEP 8](https://pep8.org/) style guidelines
+- Use meaningful variable and function names
+- Add docstrings to functions and classes
+- Keep functions focused and small
+- Handle errors gracefully
+
+### Shell Scripts
+- Use `#!/bin/bash` shebang
+- Quote variables: `"$variable"`
+- Check command success: `|| exit 1`
+- Add comments for complex logic
+
+### Documentation
+- Use clear, concise language
+- Include code examples where helpful
+- Keep line length under 80-100 characters
+- Use Markdown formatting consistently
+
+## 🧪 Testing
+
+### Manual Testing
+Before submitting a PR:
+1. **Test against live network**: Ensure your changes work with the production network
+2. **Test edge cases**: Try unusual inputs and scenarios
+3. **Cross-platform check**: Test on multiple platforms if possible (Linux, macOS)
+4. **Documentation check**: Verify any documentation changes are accurate
+
+### For Miner Changes
+```bash
+# Test miner runs without errors
+python3 miners/linux/rustchain_linux_miner.py --wallet test --dry-run
+
+# Verify API connectivity
+curl -sk https://50.28.86.131/health
+curl -sk https://50.28.86.131/epoch
+```
+
+## 📝 Pull Request Process
+
+1. **One PR per feature/fix**: Keep PRs focused on a single change
+2. **Small commits**: Break large changes into logical commits
+3. **Update documentation**: Add or update docs for new features
+4. **Resolve conflicts**: Rebase on latest `main` if needed
+5. **Respond to feedback**: Address reviewer comments promptly
+
+### PR Checklist
+- [ ] Code follows project style guidelines
+- [ ] Changes tested against live network
+- [ ] Documentation updated (if applicable)
+- [ ] Commit messages follow format guidelines
+- [ ] No unnecessary files included (logs, cache, etc.)
+- [ ] PR description is clear and complete
+
+## 🔍 Code Review
+
+### What to Expect
+- Maintainers will review your PR within a few days
+- You may be asked to make changes
+- Be patient and respectful in discussions
+- Reviews help improve code quality
+
+### Common Review Feedback
+- Code style issues
+- Missing error handling
+- Insufficient testing
+- Documentation gaps
+- Performance concerns
+
+## 🌟 First-Time Contributors
+
+Welcome! We're excited to have you. Here are some tips:
+
+1. **Start small**: Pick a `good first issue` or make a small documentation improvement
+2. **Ask questions**: Don't hesitate to ask for clarification in issues or PRs
+3. **Read existing code**: Understand the patterns before making changes
+4. **Be patient**: Learning a new codebase takes time
+
+### Good First Issues
+Look for issues labeled:
+- [`good first issue`](https://github.com/Scottcjn/Rustchain/labels/good%20first%20issue)
+- [`help wanted`](https://github.com/Scottcjn/Rustchain/labels/help%20wanted)
+- [`documentation`](https://github.com/Scottcjn/Rustchain/labels/documentation)
+
+## 💰 Claiming Bounties
+
+### For Bounty Issues
+1. **Check availability**: Ensure no one is already assigned
+2. **Comment intent**: Let maintainers know you're working on it
+3. **Follow requirements**: Meet all acceptance criteria
+4. **Include wallet**: Add your RTC wallet address in the PR description
+
+### Bounty Format in PR
+```markdown
+## Bounty Claim
+- Issue: #XX
+- RTC Wallet: your-wallet-name
+```
+
+## 📧 Questions?
+
+- **GitHub Issues**: For bug reports and feature requests
+- **GitHub Discussions**: For questions and general discussion
+- **Pull Requests**: For code and documentation contributions
+
+## 🙏 Thank You!
+
+Every contribution, no matter how small, helps make RustChain better. We appreciate your time and effort!
+
+---
+
+**RTC Value**: 1 RTC ≈ $0.10 USD  
+**Live Network**: https://50.28.86.131  
+**Explorer**: https://rustchain.org/explorer