Ratatui

1. What is Ratatui?
2. Ratatui - Hello World
3. Ratatui - handle keyboard events
4. Ratatui - a more structured way to handle state
5. Ratatui - counting keyboard events
6. Ratatui - a stopwatch or automatic counter - blocking vs. polling events
7. Ratatui - counter
8. Ratatui - confirmation popup to verify intent to exit
9. Ratatui - widgets