BigClown Core Module - Hello world app - Let's try to find the shortest yet still understandable

This is a very simple app that prints “Hello World” over USB serial line emulation on ‘B’ button key press.

yes, usb doesn’t work with router omnia, but with other hardware as raspberry or pc work fine.
In now we change power management and speed on periphery, it looks stable, but we must test and to test consumption.