Update free-courses-hi.md (#8445)

* Update free-courses-hi.md

Added a free compiler design course in hindi

* Update courses/free-courses-hi.md

* Update courses/free-courses-hi.md

Co-authored-by: Eric Hellman <eric@hellman.net>

courses/free-courses-hi.md

@@ -167,6 +167,7 @@
 
 ### Compiler Design
 
+* [Compiler Design](https://www.youtube.com/playlist?list=PL9FuOtXibFjVR-87LcU-DS-9TJcbG97_p) - Abhishek Sharma
 * [Compiler Design (Complete Playlist)](https://www.youtube.com/playlist?list=PLxCzCOWd7aiEKtKSIHYusizkESC42diyc) - Gate Smashers (YouTube)
 * [Compiler Design Tutorial In Hindi](https://www.youtube.com/playlist?list=PL-JvKqQx2Ate5DWhppx-MUOtGNA4S3spT) - University Academy