Doc: Add a new Extention Feature(extention14.kt)

Description:

Issue will be assigned on a first come first serve basis.
If you are thinking to make a pr then at first be sure to get assigned.
before pushing your PR please make sure to fetch upstream.
your pr should be pushed on the develop branch only.
try to complete your assigned task within 3 to 5 days and if you need more time then please let me know. As the program has limited time only so please try to complete as fast as you can.
With your PR try to send a screenshot or screen recording of your work