Funny, to me showing the keystrokes felt like a cliche in "modern"/flashy CLI app readmes :) I guess it's more often used in youtube videos.

I used screenkey to display the keystrokes and Peek to record the gif. I actually wrote some instructions for myself so I remember how I did it if I want to update the gif: https://github.com/mgunyho/tere/blob/master/demo/README.md