Added Kotlin Course in Bengali (#10306)

* Added Kotlin Course in Bengali

* New

* Update courses/free-courses-bn.md

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

---------

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

courses/free-courses-bn.md

@@ -230,6 +230,7 @@ Online School
 ### Kotlin
 
 * [Chapter 1 : Kotlin Basic Concepts Bangla](https://www.youtube.com/playlist?list=PL_XxuZqN0xVDpRWRnXPWZcWIvz0JbeQe5) - Stack Learner
+* [Kotlin For Android - Bangla](https://www.youtube.com/playlist?list=PLgyuGbgggWA3ORqemnq9adIzvNhSXjJTr) - Touhid Apps!
 
 
 ### MongoDB