Update PWM.cpp

I initilized the ADC registers and added the ADC interupt function.
We need to add a display in order to test the code.  The display of the code takes place in the ADC interupt where I commented.
Merge branch 'master' of https://github.com/kevstauffer/Microcontrolled-Flyback-Converter into kevstauffer-master

Conflicts:
	PWM/PWM.cpp

	modified:   PWM/PWM.cpp
Merge branch 'master' of https://github.com/streslab/Microcontrolled-Flyback-Converter