Add cheatsheet

_presentations/cli.html

@@ -75,7 +75,8 @@
 gow is short for Gnu On Windows and installing it will give you access to common UNIX commands, right from the Command Prompt! Recommended.
 
 [Cygwin](http://cygwin.com/)  
-Cygwin is a "Linux-like environment" for Windows.    
+Cygwin is a "Linux-like environment" for Windows. [Here](https://www.pcwdld.com/cygwin-cheat-sheet) is a cheat sheet for getting started.  
+
 
 Mac: [iTerm2](https://iterm2.com/)  
 Another option instead of the Terminal with some bonus configuration features.  
@@ -230,6 +231,7 @@
 - [awesome-shell](https://github.com/alebcay/awesome-shell)
 - [Command Line Cheat Sheet](https://www.git-tower.com/blog/posts/command-line-cheat-sheet)
 - [Command Prompt Cheat Sheet](http://simplyadvanced.net/blog/cheat-sheet-for-windows-command-prompt/)
+- [Cygwin Cheat Sheet](https://www.pcwdld.com/cygwin-cheat-sheet)
 - [Software Carpentry Course](http://swcarpentry.github.io/shell-novice/)
 - [Command Line Mystery Game](https://github.com/veltman/clmystery)
 - [Command Line Scavenger Hunt](https://digiprez.com/cli-scavenger-hunt)