Add CONTRIBUTING.md - XMRT standards

Author: DevGruGold

CONTRIBUTING.md

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+# Contributing to xmrt-test-env
+
+Welcome to the XMRT ecosystem! 🔐 Your contributions help build a more private and free financial future.
+
+## How to Contribute
+
+### Code Contributions
+1. Fork the repository
+2. Create your feature branch (`git checkout -b feature/PrivacyEnhancement`)
+3. Commit your changes (`git commit -m 'Add zero-knowledge proof support'`)
+4. Push to the branch (`git push origin feature/PrivacyEnhancement`)
+5. Open a Pull Request
+
+### Security & Privacy
+- Report security issues privately to xmrtsolutions@gmail.com
+- Never commit private keys or sensitive data
+- Follow cryptographic best practices
+- Ensure user privacy is maintained
+
+### Testing
+- Write tests for new features
+- Ensure all tests pass
+- Test on multiple networks (mainnet, testnet)
+- Verify privacy features work as intended
+
+## Code Standards
+- Follow blockchain best practices
+- Document cryptographic implementations
+- Ensure code is auditable
+- Maintain backwards compatibility
+
+## Questions?
+
+Join our community:
+- Website: https://xmrt.io
+- Email: xmrtsolutions@gmail.com
+
+*Building Financial Freedom, One Block at a Time* 🚀