Combining the delay function with the loop function allows us to create a blinking effect with the LED.
We will do this by setting a delay of 1 second (1000 milliseconds) between the LED being on (HIGH) and the LED being off (LOW).
We're going to use an int variable named DELAY so that we can change its value without having to type in numbers over and over everywhere.
int GREEN = 3;
int DELAY = 1000;
// basic functions
// setup LED modes
// we're specifying that we're going to send information to this LED
// High turns things on
// low turns things off