Added cheat sheet refence to swift and c# (#4767)

* Added cheat sheet refence to swift and c#

* Modified section from PR feedback

free-programming-cheatsheets.md

@@ -7,6 +7,7 @@
 * [JavaScript](#javascript)
   * [Vue.js](#vuejs)
 * [Kubernetes](#Kubernetes)
+* [Language Translations](#language-translations)
 * [Markdown](#markdown)
 * [MongoDB](#mongodb)
 * [Python](#python)
@@ -50,6 +51,9 @@
 
 * [Handy Cheat Sheet for Kubernetes Beginners](https://kubernetes.io/docs/reference/kubectl/cheatsheet/) - Kubernetes Documentation: kubectl Cheat Sheet
 
+### Language Translations
+
+* [Swift and C# Quick Reference - Language Equivalents and Code Examples](http://www.globalnerdy.com/wordpress/wp-content/uploads/2015/03/SwiftCSharpPoster.pdf) - Globalnerdy (PDF)
 
 ### Markdown