Added a new course (#6950)

Added a new Next.jS by the famous **CodewithHarry**/

courses/free-courses-hi.md

@@ -123,6 +123,7 @@
 
 #### Next.js
 
+* [Next.js Tutorials for Beginners in Hindi](https://www.youtube.com/playlist?list=PLu0W_9lII9agtWvR_TZdb_r0dNI8-lDwG) - CodeWithHarry
 * [NextJS Tutorial In Hindi](https://www.youtube.com/playlist?list=PLwGdqUZWnOp2rDbpfKAeUi9f8qZMS7_cv) - Vinod Bahadur Thapa (Thapa Technical)