Skeleton/mainmenu

This is my first pull request ont his project. The base for the views/navigation has been stablished, also the QR reading process. I will create a new branch for this one, so any change request about the code will be fixed on the next pull request.

Regards
Hahaha a little license fro the original author. Forgot to tell you just to check the package sphere.io.glass. There are two more packages which are from the original BarcodeEye library, just few lines of one class of those packages have been modified. For sure, it needs a clean up.