Update free-courses-hi.md (#8307)

Added a tutorial for Kotlin.

courses/free-courses-hi.md

@@ -293,6 +293,7 @@
 
 ### Kotlin
 
+* [Kotlin Beginner Tutorials Hindi | Complete Series](https://www.youtube.com/playlist?list=PLRKyZvuMYSIMW3-rSOGCkPlO1z_IYJy3G) - Cheezy Code
 * [Kotlin Programming Complete in one Video (Hindi)](https://www.youtube.com/watch?v=uoP4JKHgzDE) - Geeky Shows, `tch.:` Rajesh Kumar