added Artificial intelligence heading and one course in free-courses-hi.md (#7310)

* added Artificial intelligence heading and one course in it

* updated title to original title

* Update courses/free-courses-hi.md

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

courses/free-courses-hi.md

@@ -2,6 +2,7 @@
 
 * [Algorithms](#algorithms)
 * [Android](#android)
+* [Artificial Intelligence](#artificial-intelligence)
 * [Assembly](#assembly)
 * [Bash and Shell](#bash-and-shell)
 * [Blockchain](#blockchain)
@@ -56,6 +57,11 @@
 * [Complete Android Development Course in Hindi](https://www.youtube.com/playlist?list=PLUhfM8afLE_Ok-0Lx2v9hfrmbxi3GgsX1) - Neat Roots
 
 
+### Artificial Intelligence
+
+* [Artificial Intelligence (Complete Playlist)](https://www.youtube.com/playlist?list=PLxCzCOWd7aiHGhOHV-nwb0HR5US5GFKFI) - Gate Smashers, `tch.:` Varun Singla
+
+
 ### Assembly
 
 * [x64 Assembly Language](https://www.youtube.com/playlist?list=PL-DxAN1jsRa-3KzeQeEeoL_XpUHKfPL1u) - The Cyber Expert