Added a new Hindi Course on App Dev for Students (#7480)

* Update free-courses-hi.md

* fix: escape pipes from resource titles

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

courses/free-courses-hi.md

@@ -60,6 +60,7 @@
 
 * [Android Development Tutorial for Beginners](https://www.youtube.com/playlist?list=PLUcsbZa0qzu3Mri2tL1FzZy-5SX75UJfb) - Anuj Bhaiya
 * [Android Development Tutorials in Hindi](https://www.youtube.com/playlist?list=PLu0W_9lII9aiL0kysYlfSOUgY5rNlOhUd) - CodeWithHarry
+* [App Development Course For School Students \| Certified Course By Coding Blocks Junior](https://youtube.com/playlist?list=PLhLbJ9UoJCvu4ktQMUJJq-D_6-Eoz8lOk) - Coding Blocks Junior
 * [Complete Android Development Course in Hindi](https://www.youtube.com/playlist?list=PLUhfM8afLE_Ok-0Lx2v9hfrmbxi3GgsX1) - Neat Roots