Add example shutdown python script

safepy_shutdown.py

+#!/usr/bin/env python
+import RPi.GPIO as GPIO
+import time
+import os
+
+
+SAFEPI_PIN=36
+
+GPIO.setmode(GPIO.BOARD)
+GPIO.setup (SAFEPI_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)
+while True:
+    if (GPIO.input(SAFEPI_PIN) == False):
+        print "SafePI detected power loss. Shutting down the system"
+        os.system ("shutdown -h now")
+        break
+    time.sleep (1)