insert a imgur gif in readme file code example
Example 1: how to add image in github readme

Example 2: how to add image in readme
recommended
You really should use relative urls. That way they'll work better for private repos as well.

supposing your repo has latest.png inside the screenshots folder.
~B
or right click on image from github and open image in new tab and copy url from there and past in Readme.md
e.g
