Added control for the pump via GPIO

pump.py

@@ -0,0 +1,12 @@
+import RPi.GPIO as GPIO
+import time
+
+pin = 4
+
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(pin, GPIO.OUT)
+
+def switch_pump(state):
+    GPIO.output(pin, state)
+
+