Add PyTorch Cheat Sheet (#6222)

* Add PyTorch Cheat Sheet

* put lists in order

* fix order

more/free-programming-cheatsheets.md

@@ -169,6 +169,12 @@
 * [Perl Reference card](https://michaelgoerz.net/refcards/perl_refcard.pdf) (PDF)
 
 
+### PyTorch
+
+* [PyTorch Framework Cheat Sheet](https://www.simonwenkel.com/publications/cheatsheets/pdf/cheatsheet_pytorch.pdf) - Simon Wenkel (PDF)
+* [PyTorch Official Cheat Sheet](https://pytorch.org/tutorials/beginner/ptcheat.html) - PyTorch (HTML)
+
+
 ### Python
 
 * [Comprehensive Python Cheat Sheet for Beginners](https://medium.com/the-codehub/comprehensive-python-cheat-sheet-for-beginners-5d76bb038fa2) - Rishi Sidhu, Medium (HTML)