docs: Add comprehensive contributing guide and GitHub Sponsors support

✨ New Documentation:
- Added comprehensive CONTRIBUTING.md guide with setup, coding standards, and workflow
- Includes templates for PRs, bug reports, and feature requests
- Covers testing guidelines and community standards

📝 README Updates:
- Removed support email and directed users to GitHub Issues/Discussions
- Added 'Support the Project' section linking to GitHub Sponsors
- Improved support section with better organization

🤝 Community Improvements:
- Clear contribution guidelines for new developers
- Standardized development workflow and coding standards
- Better support channels and funding opportunities

Author: HTMLGuyLLC