Added gm3

RaspberryPi/calculate.c

@@ -78,6 +78,7 @@ float absoluteHumidity(sensor *sensor) {
 }
 
 int compareSensors(sensor *inside, sensor *outside) {
+        //returns 1 if window should be opened
 	if (absoluteHumidity(inside) <= absoluteHumidity(outside)) return 1;
 	return 0;
 }