Added detailed documentation for new due date functionality:
- Updated features list to include due date capabilities
- Added specialized due date endpoints documentation
- Documented query parameters for filtering and sorting
- Added usage examples for all due date operations
- Updated project structure to reflect current state
- Added timezone support documentation
- Included complex filtering examples
- Document category management features
- Update API endpoints to include categories
- Revise project structure to reflect current implementation
- Add usage examples for categories and filtering
- Remove references to unimplemented features
- Update models documentation for Todo and Category
- Add project structure with FastAPI, SQLAlchemy, and Alembic
- Implement Todo model with CRUD operations
- Add REST API endpoints for todo management
- Configure SQLite database with migrations
- Include health check and API documentation endpoints
- Add CORS middleware for all origins
- Format code with Ruff
