epaper2in13b

[villeneuve]

Hello,
I have done a pull request,but I'm not familiar with github, not sure ir has worked!
So I just repeat here, found 2 bugs in epaper2in13b.py
all reference to epdif.EPD_WIDTH and epdif.EPD_HEIGHT
to replace with EPD_WIDTH and EPD_HEIGHT
VCM_DC_SETTING to replace by VCM_DC_SETTING_REGISTER to have the sleep function working
Also I have proposed an exemple for this 2in13 display (uploaded)
Based on Waveshare esp32 driver board (but of course can be adapted)
And an interesting method to permit writing text in portrait and/or lanscape mode
check here: https://forum.micropython.org/viewtopic.php?f=18&t=6319
Thanks for your librairy it works perfectly