Update index.md

Author: baillma3

index.md

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 ## Graphics principles cheatsheet
 
-Under construction. 
-
 The link to the cheatsheet github repository is [here](https://github.com/GraphicsPrinciples/CheatSheet).
 
 This the landing page for the [cheatsheet](https://github.com/GraphicsPrinciples/CheatSheet/blob/master/NVSCheatSheet.pdf). You can access the [cheatsheet on GitHub](https://github.com/GraphicsPrinciples/CheatSheet/blob/master/NVSCheatSheet.pdf).