Open quicktime recorder:
Make sure to have the "Record Selected Portion" selected.
Record your screen and stop it using the "Stop" button on your navigation bar
Go to ezgif.com/video-to-gif
Convert your video to GIF, make sure the file smaller than 10MB, and download your GIF:
Github only accepts files smaller than 10MB to be displayed on the README. If your file is larger than 10MB, optimize it using the GIF Optimizer.
Go to hackmd.io, create a free account, and create a new note
In your note, copy/paste the README template to your hackmd note:
Drag and drop your GIF file to your Hackmd note:
^ Note: If your GIF is not displaying, check if your GIF file is larger than 10MB. If so, go back to Step 2.3 to optimize your GIF size.