Creation of RPiWobbulator ADC Module

Signed-off-by: Gray Remlin <gryrmln@gmail.com>
Modify rpi_voltmeter.py to use RPiWobbulator ADC Module

The Rpi VoltMeter v1.0 rpi_voltmeter.py file was copied from
https://github.com/mi0iou/RPi_VoltMeter and modified to use
the RPiWobbulator ADC Module WobbyHW/ADC.py.

Signed-off-by: Gray Remlin <gryrmln@gmail.com>