monacoprinsen

Added ADC examples

@ivmarkov thanks for the input. I have added 3 examples: Simple adc example St7789 adc example St7789 spi example If you prefer that I remove the St7789 examples I can...

@ivmarkov Alright will do that!

@ivmarkov now it should be up to date.

Will do

@ivmarkov sorry for the delay.... It should be ok now.

@ivmarkov ok will look into that.

@ivmarkov thanks, adjusted it! Sorry for the mess, hopefully next contribution will be a little cleaner.

This branch works great in async mode!