Two BUTTONS two LEDs
This code uses two LEDs and two BUTTONS. The second LED is on
pin 13. Pin 13 ALWAYS has a LED connected to it, and is noted
with an L on your Arduino UNO. Pressing the momentary switch 1
will either turn on an LED or run a special function that
blinks an LED with a set patter. Pressing momentary switch 2
will do the same, but output to a different LED or function.