Add seaborn cheatsheet

[knightcube]

https://seaborn.pydata.org/

[veshitala]

Hey @knightcube I have prepared some awesome Ipython notebooks can I contribute all of them to your repository .They all are well documented and and cover pretty much all the basic use case of this library

[kailashahirwar]

@knightcube Sure. I will add.
@knightcube Awesome. Please add.