Benchcast for Android

This is just a first version of the app to get the most basic data - which is the frame rate for requestAnimationFrame of the JS receiver running on a chromecast....

The idea is to add over time some other measures of performance and networking, such as round-trip time for a message from app to chromecast and back...

it just displays how many frames it could run in the last 1second.

Contribute Pull Requests here https://github.com/Mackenzie-Serres/benchcast