Update free-courses-hi.md (#8315)

* Update free-courses-hi.md

Added a Tailwind CSS tutorial.

* Update free-courses-hi.md

Conflict resolved

courses/free-courses-hi.md

@@ -230,6 +230,7 @@
 
 #### Tailwind CSS
 
+* [Tailwind css hindi](https://www.youtube.com/playlist?list=PLLCu4ndnReXLXfD-iIGBEB6_l8uF6TMNO) - NST Infotech
 * [Tailwind CSS In Hindi](https://www.youtube.com/playlist?list=PLwGdqUZWnOp3l8tWTcB7R7Bsgd86lCa8a) - Thapa Technical
 * [Tailwind CSS Tutorials in Hindi](https://www.youtube.com/playlist?list=PLu0W_9lII9ahwFDuExCpPFHAK829Wto2O) - CodeWithHarry