TO-DO LIST

1. Task Management: This Python code creates a To-Do List Manager where users can add, mark as completed, or delete tasks. They can also filter tasks based on completion status.
2. Design Patterns: The code uses the Memento and Builder Patterns. Memento captures task states for undo and redo actions, while Builder enhances task creation flexibility.
3. Undo and Redo**: The app allows users to undo and redo actions like adding, completing, or deleting tasks, improving task management efficiency.