Added a Handy Cheat Sheet for Kubernetes (#4641)

* Update free-programming-cheatsheets.md

Added a Cheat Sheet for Kubernetes Beginners

* Update free-programming-cheatsheets.md

* Update free-programming-cheatsheets.md

Added Kubernetes Cheat Sheet with correct formatting

* Update free-programming-cheatsheets.md

* Update free-programming-cheatsheets.md

free-programming-cheatsheets.md

@@ -6,6 +6,7 @@
 * [HTML / CSS](#html--css)
 * [JavaScript](#javascript)
   * [Vue.js](#vuejs)
+* [Kubernetes](#Kubernetes)
 * [Markdown](#markdown)
 * [MongoDB](#mongodb)
 * [Python](#python)
@@ -42,6 +43,11 @@
 * [Vue Essential Cheatsheet](https://www.vuemastery.com/pdf/Vue-Essentials-Cheat-Sheet.pdf) - Vue Mastery (PDF)
 
 
+### Kubernetes
+
+* [Handy Cheat Sheet for Kubernetes Beginners](https://kubernetes.io/docs/reference/kubectl/cheatsheet/) - Kubernetes Documentation: kubectl Cheat Sheet
+
+
 ### Markdown
 
 * [Markdown Here](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet) - Adam Pritchard