Added

• Public Python API (get_package_stats function) for programmatic access to PyPI package statistics
• Automatic retry mechanism with exponential backoff for handling transient network errors and rate limits
• Custom exception hierarchy (PyPIStatsError, PackageNotFoundError, APIError) for better error handling
• Comprehensive test suite with unit tests for core functionality (client, cache, processing, utilities)
• GitHub Actions CI/CD workflow for automated testing across Python 3.8-3.12
• Test fixtures and sample data for reliable testing

Changed

• Major codebase refactoring with improved architecture and separation of concerns
• Reorganized code structure: moved core functionality to core/ directory (client, cache, exceptions, models, processing, constants)
• Introduced api.py module providing clean public API interface
• Enhanced README documentation with clearer structure and examples