Countdown timer

Duplication of Reddit tinkter Tutorial on a Countdown Timer

This post seemed like an interesting one to demonstrate the use of "async" windows in PySimpleGUI. It was roughly 1/2 the size of the tkinter version.

https://www.reddit.com/r/Python/comments/eh9461/countdown_gui_using_python_it_is_not_pretty/

Here is how it looks on Windows...