Enhance README with comprehensive project information

[superninja-app]

Description

This PR enhances the repository with comprehensive documentation and CI setup:

• Enhanced README.md with project information
• Added CI workflow for automated builds and tests
• Added security policy

Changes Made

• Added detailed project description in README.md
• Listed key features and improvements
• Included technical stack information
• Added getting started instructions
• Referenced IMPROVEMENTS.md for detailed improvement history
• Added CI workflow for automated builds and tests
• Created SECURITY.md with vulnerability reporting guidelines

Why This Matters

• A comprehensive README helps new developers understand the project quickly
• CI workflow ensures that all code changes are automatically built and tested
• Security policy provides guidelines for reporting vulnerabilities
• These additions improve code quality, reliability, and project governance