Add ncstate-sat/popover

[julianobrasil]

You could add this component, based on the official Angular Material 2 Project: https://github.com/ncstate-sat/popover

There's a demo over here.

[brillout]

Is there a reason you didn't use https://devarchy.com/angular to add it?

[julianobrasil]

A good reason: I didn't know there was this page to submit it 😄