Update free-courses-hi.md (#8631)

* Update free-courses-hi.md

Added a youtube tutorial for PHP in Hindi.

* Update courses/free-courses-hi.md

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

courses/free-courses-hi.md

@@ -441,6 +441,7 @@
 ### PHP
 
 * [Core PHP (Hindi)](https://www.youtube.com/playlist?list=PLbGui_ZYuhigFdLdbSI2EM2MrJB7I0j-B) - Rajesh Kumar, Geeky Shows
+* [PHP MYSQL Tutorial In Hindi \| Backend Development in Hindi in 2020](https://www.youtube.com/playlist?list=PLwGdqUZWnOp1U4kemcU_vF9KQuHXlNxkb) - Thapa Technical
 * [PHP Tutorial for beginners in Hindi](https://www.youtube.com/playlist?list=PLmGElG-9wxc_Hp_bqKH0-cpeboH1_sQg7) - ScoreShala
 * [PHP Tutorial in Hindi / Urdu](https://www.youtube.com/playlist?list=PL0b6OzIxLPbyrzCMJOFzLnf_-_5E_dkzs) - Yahoo Baba
 * [PHP Tutorials in Hindi](https://youtube.com/playlist?list=PLu0W_9lII9aikXkRE0WxDt1vozo3hnmtR) - CodeWithHarry