Add comprehensive scholarship management application

[noyder6143]

This commit adds a complete local scholarship management system with the following features:

• Database layer with SQLite for persistent storage
• Models for Scholarships, Students, and Applications with full CRUD operations
• Interactive CLI interface with menu-driven navigation
• Application tracking with multiple status states
• Search and filtering capabilities
• Sample data loader for quick testing
• Comprehensive documentation (README and Quick Start guide)
• Basic test suite to verify functionality

The application allows users to:

• Manage scholarship listings with details, amounts, and deadlines
• Maintain student/applicant records with academic information
• Track scholarship applications with status updates
• View statistics and reports
• Search across all entities

All files follow Python best practices with proper module structure, documentation, and error handling.