provide link to cheatsheet

Author: baillma3

index.md

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 ## Welcome to the graphics principles cheat sheet landing page. 
 
-This the landing page for the cheat sheet. 
+This the landing page for the [cheatsheet](https://github.com/GraphicsPrinciples/CheatSheet/blob/master/NVSCheatSheet.pdf). 
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+You can access the [cheatsheet on GitHub](https://github.com/GraphicsPrinciples/CheatSheet/blob/master/NVSCheatSheet.pdf). 
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