Added files for the Seeedstudio Hercules 15A Dual Motor Controller, based on
the Arduino ATmega328p, running at 5V 16MHz. For now, it is connected to the
Raspberry Pi via a USB-serial adapter /dev/ttyUSB0 57600bps for both flashing
and ascii control commands. avrdude is used to flash program with 'arduino'
style serial bootloader.

The app commands at serial level is now f b l r 1 2 3 4 and ' ' for
forwards backwards left right speeds 1 2 3 4 ' ' for stop.