🚀 Enhanced Node.js Course Management API

✅ All Features Tested and Working:

• GET /courses - Returns courses with pagination ✅
• POST /courses - Creates courses with validation ✅
• GET /courses?search=query - Search functionality ✅
• PUT /courses/:id - Updates courses ✅
• DELETE /courses/:id - Deletes courses ✅

Improvements Made:

• Code Structure: Reorganized from monolithic app.js to modular architecture
• New Features: Added pagination, search functionality, and input validation
• Enhanced API: Better error handling and new endpoints
• Documentation: Updated README with comprehensive contribution details

Technical Improvements:

• Modular folder structure (models, routes, controllers, middleware, config)
• Enhanced Mongoose schema with validation
• Comprehensive error handling
• Input validation middleware
• Search functionality integrated into main endpoint

New API Endpoints:

• GET /courses?page=1&limit=10 - Paginated course listing
• GET /courses?search=query - Search courses by title or description

This makes the API more robust, maintainable, and production-ready while maintaining backward compatibility.