Add Colors scheme

"Colors" scheme which picked some colors from [mrmrs](http://mrmrs.cc/)'s [Colors project](http://clrs.cc/), licensed under MIT.

Seems a bit giddy in light but works nicely in dark. Any chance of merging?

![Colors in light scheme](http://i.imgur.com/TFtzpWB.png)

![Colors in dark scheme](http://i.imgur.com/KN1eN2F.png)