Reading VCC voltage from interpreter now working, as well as PB2 input.

The last two keywords were for using PB2 as an interrupt in the interpreter, but I think I am going to leave that out for now. Seems like an unnecessary hassle and complication for the scope of this project at this time and unsure what the use case would be.

So at this point I feel comfortable saying the Tiny Bit Machine TGRK interpreter is complete!

Will post the code to my github and link it here within the next couple days.

Next I will work on build instructions and a more complete components list. The components list is done except for exact resistor values. 

I need to test using the new voltage divider resistors and capacitor for reading ADC, as a measure to save power consumption. But we want accurite enough readings for reading VCC voltage and button presses.