Update free-courses-en.md (#11589)

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

courses/free-courses-en.md

@@ -1233,6 +1233,7 @@
 ### Kotlin
 
 * [Advanced Android with Kotlin](https://www.udacity.com/course/advanced-android-with-kotlin--ud940) (Udacity)
+* [Android Development Full Tutorial 2023 \| Kotlin](https://www.youtube.com/watch?v=9-pFPGAOSZQ) - Scaler
 * [Android Kotlin Tutorial: Create Android Apps using Kotlin](https://www.youtube.com/playlist?list=PLlxmoA0rQ-Lw5k_QCqVl3rsoJOnb_00UV) - Sriyank Siddhartha
 * [Android with kotlin](https://www.youtube.com/playlist?list=PLlxmoA0rQ-Lw5k_QCqVl3rsoJOnb_00UV) - Smartherd
 * [Developing Android Apps with Kotlin](https://www.udacity.com/course/developing-android-apps-with-kotlin--ud9012) (Udacity)