Added a course for Mongo DB by thapa technical (#7767)

* Update free-courses-hi.md

* Update free-courses-hi.md

* Update free-courses-hi.md

* Update free-courses-hi.md

* Update free-courses-hi.md

* Update free-courses-hi.md

* Update free-courses-hi.md

courses/free-courses-hi.md

@@ -33,6 +33,7 @@
 * [Linux](#linux)
 * [Machine Learning](#machine-learning)
 * [Mathematics](#mathematics)
+* [Mongo DB](#mongo-db)
 * [Natural Language Processing](#natural-language-processing)
 * [Networking](#networking)
 * [Operating Systems](#operating-systems)
@@ -312,6 +313,11 @@
 * [Statistics And Probability](https://www.youtube.com/playlist?list=PLU6SqdYcYsfLRq3tu-g_hvkHDcorrtcBK) - Gajendra Purohit
 
 
+### Mongo DB
+
+* [Mongo DB full course for beginners](https://youtube.com/playlist?list=PLwGdqUZWnOp1P9xSsJg7g3AY0CUjs-WOa) -Thapa Technical
+
+
 ### Natural Language Processing
 
 * [Natural Language Processing with Deep NLP from Zero to Hero](https://www.youtube.com/playlist?list=PLtCBuHKmdxOefxJhd6u8KY9vTN8G5D5yG) - Fahad Hussain