Added Android course (#9955)

* Update free-courses-en.md

* Update free-courses-en.md

* Update free-courses-en.md

* Remove bogus letter

* Changed course

* Update courses/free-courses-en.md

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

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

courses/free-courses-en.md

@@ -204,6 +204,7 @@
 * [Android Basics: User Interface](https://www.udacity.com/course/android-basics-user-interface--ud834) (Udacity)
 * [Android Developer Fundamentals (Version 2) — Codelab](https://developer.android.com/courses/fundamentals-training/toc-v2)
 * [Android Developer Fundamentals (Version 2) — Concepts](https://google-developer-training.github.io/android-developer-fundamentals-course-concepts-v2/index.html)
+* [Android Development Tutorials](https://youtube.com/playlist?list=PLqM7alHXFySF_Hb1GtyvCX44dBniJ5sNy) -  GeeksforGeeks
 * [Android Performance](https://www.udacity.com/course/android-performance--ud825) (Udacity)
 * [Android with kotlin](https://youtube.com/playlist?list=PLlxmoA0rQ-Lw5k_QCqVl3rsoJOnb_00UV) - Smartherd
 * [Build Native Mobile Apps with Flutter](https://www.udacity.com/course/build-native-mobile-apps-with-flutter--ud905) (Udacity)