[Updated] Kotlin Course (#11650)

* Kotlin Course

* Update courses/free-courses-en.md

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

* Kotlin Course

* Kotlin Course

---------

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

courses/free-courses-en.md

@@ -1262,6 +1262,7 @@
 * [Kotlin Newbie To Pro](https://www.youtube.com/playlist?list=PLQkwcJG4YTCRSQikwhtoApYs9ij_Hc5Z9) - Philipp Lackner
 * [Kotlin Programming Full Tutorial 2023](https://www.youtube.com/watch?v=0MdkXBssRRg) - Scaler
 * [Kotlin Tutorial](https://www.youtube.com/playlist?list=PLsyeobzWxl7rooJFZhc3qPLwVROovGCfh) - Telusko
+* [Kotlin Tutorial - Kotlin at Light Speed](https://www.youtube.com/playlist?list=PLmtsMNDRU0BwGCBDIKKQNLYycRTnQzMfp) - Rock the JVM
 * [Kotlin Tutorial for Beginners: Basics and Fundamentals for Android](https://www.youtube.com/playlist?list=PLlxmoA0rQ-LwgK1JsnMsakYNACYGa1cjR) - Smartherd
 * [One hour Kotlin guide for beginners](https://www.udemy.com/course/one-hour-kotlin-guide-for-beginners) - Tutlets Kkang (Udemy)
 * [Teach Computer Science with Kotlin](https://kotlinlang.org/education/) - Kotlin