Add new KU example programs

[StiliyanKushev]

Add three new example programs:

• add_numbers.ku: Basic arithmetic and user input demonstration
• sudoku.ku: Sudoku solver using backtracking algorithm
• sudoku_game.ku: Interactive Sudoku game with terminal UI

These examples showcase array manipulation, control flow, user I/O, and interactive terminal applications in KU.

[StiliyanKushev]

🤖 Added Cursor AI Rules for Enhanced Development Experience

I've added comprehensive .cursorrules files to provide context-aware AI assistance when working with the KU programming language:

📁 New Files Added:

🎯 .cursorrules (Main Rules)

• Master configuration with context-specific guidance
• Quick reference for essential commands and KU syntax
• Critical guidelines and emergency procedures
• Links to specialized context rules

🧪 .cursorrules-testing (Testing Context)

• Compiler testing procedures (./test.sh -c)
• Test structure and organization guidelines
• Platform-specific testing (Linux/macOS via Docker)
• Memory management testing patterns
• CRITICAL: Emphasizes simulator deprecation - compiler mode only

🚀 .cursorrules-running (Execution Context)

• Compilation workflow with ./kulang.sh and ./kulang-macos.sh
• Platform differences (Linux native vs macOS Docker)
• Memory management and syscall handling
• Interactive application development guidelines
• Runtime debugging and performance optimization

🔄 .cursorrules-workflow (Repository Context)

• Git workflow and branching strategy
• Code quality standards and file organization
• Pull request and contribution guidelines
• Platform compatibility requirements
• Community and security considerations

🎯 Benefits:

• Context-aware assistance: AI provides appropriate guidance based on current task
• Platform-specific guidance: Proper handling of Linux vs macOS development
• Quality assurance: Consistent coding standards and testing procedures
• Knowledge preservation: Captures KU-specific development patterns and best practices
• Onboarding: Helps new contributors understand project conventions

These rules will significantly improve the AI assistant's ability to help with KU development tasks! 🚀