Adding media tile pattern

@DoSomething/front-end 

Hey - I'm not ready to merge this in, but wanted to get some eyes on it to see if I am headed in the right direction. Also to start getting some feedback on code style practices here. Let me know if I'm on the right track!

This adds a new "Media Tile" pattern to neue that looks like the tiles in the gallery duo pattern. I think the next step would be to refactor the gallery duo pattern so that it just serves as a wrapper for any tile that is put in it, much like the other gallery patterns. 

Cheers :wine_glass: 
@weerd hmm Good question. This pattern seemed specific to having the image in the left column and text to the right. The wrapper on the img seems to help maintain that layout, allowing the image width to fill however wide it is based on breakpoint.