Update free-courses-en.md (#6083)

* Update free-courses-en.md

Added an awesome youtube video that explains self supervised learning in computer vision

* Update free-courses-en.md

updated order

* Update free-courses-en.md

* Update free-courses-en.md

Update playlist url

courses/free-courses-en.md

@@ -297,6 +297,7 @@
 * [Introduction to Reinforcement learning with David Silver](https://www.youtube.com/playlist?list=PLqYmG7hTraZBiG_XpjnPrSNw-1XQaM_gB) - David Silver
 * [MIT 6.S094: Deep Learning for Self-Driving Cars](https://selfdrivingcars.mit.edu)
 * [MIT 6.S191: Introduction to Deep Learning](http://introtodeeplearning.com) - Alexander Amini, Ava Soleimany
+* [NYU Deep Learning SP21](https://youtube.com/playlist?list=PLLHTzKZzVU9e6xUfG10TkTWApKSZCzuBI) Alfredo Canziani
 * [Practical Deep Learning For Coders taught](http://www.fast.ai) - Jeremy Howard
 * [Practical Deep Learning for Coders, v3 (using fastai library)](https://course.fast.ai)
 * [Self-Paced Courses for Deep Learning](https://developer.nvidia.com/deep-learning-courses)