Added a method to turn decide how many LED to turn on for a given potentiometer value

Implemented a way to decide how many of the 10 LEDs will turn on for a given ADC value by separating 0xFFF into 10 ranges from lowest to highest. Each range will correspond to a different potentiometer position These ranges will be used to implement linear scaling. The added subroutine (get_number_of_on_led) uses a series of if statements, the commenting style used reflects this.