Added STUDY MART YouTube channel link

Author: mdhasanurdev

README.md

@@ -746,4 +746,5 @@
 * [Bangla Coding Tutor](https://www.youtube.com/c/BanglaCodingTutor)
 * [Megaminds Learning](https://www.youtube.com/@MegamindsLearning)
 * [Learn With Tawhid](https://www.youtube.com/@LearnWithTawhid)
-* [সুদীপ্ত কর / Sudipta Kar](https://www.youtube.com/@cryptexcode)
+* [সুদীপ্ত কর / Sudipta Kar](https://www.youtube.com/@cryptexcode)
+* [STUDY MART](https://www.youtube.com/@StudyMart)