add `epd2in13g.py`

[loiccoyle]

from: https://github.com/waveshareteam/e-Paper/blob/master/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in13g.py

[loiccoyle]

This one can display black, white, yellow and red, so the interface to display color is slightly difference.

https://www.waveshare.com/wiki/2.13inch_e-Paper_HAT_(G)_Manual#Overview

It maps the input image to the nearest color in its color palette. Previous single color modules require a b&w image and a color image. So it will require some extra changes.

[loiccoyle]

I don't have this this display to test so this is stuck for now.