Update free-courses-bn.md added krish naik python course (#10679)

* Update free-courses-bn.md added krish naik python course

* Update free-courses-bn.md added python course by krish naik and arranged it in alphabetical order

* Update free-courses-bn.md

* Updated as per Instructions

* Updated the title

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courses/free-courses-en.md

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 * [Bento Python Learning Track](https://bento.io/topic/python) (Bento)
 * [Berkeley's Structure and Interpretation of Computer Programs](https://cs61a.org)
 * [Codesdope](https://www.codesdope.com/python-introduction)
+* [Complete Python Playlist](https://www.youtube.com/playlist?list=PLZoTAELRMXVNUL99R4bDlVYsncUNvwUBB) - Krish Naik
 * [CS50's Introduction to Programming Using Python](https://cs50.harvard.edu/python/) - David J. Malan (Harvard OpenCourseWare and edX)
 * [Data Structures And Algorithms In Python](https://www.youtube.com/playlist?list=PLrk5tgtnMN6TYBW0-U4YhIRyYEVpqVEnJ) - Coding Ninjas
 * [Django Wednesdays](https://www.youtube.com/playlist?list=PLCC34OHNcOtqW9BJmgQPPzUpJ8hl49AGy) - Codemy.com