Added tutorial for tilt sensor.

Author: Rafael Koch Peres

sensor-tilt/README.md

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+## Sensor KY-020: Tilt switch sensor
+
+![ky020](images/ky020.jpg)
+
+The pins for the extension board, where (`sensor: board`) - following the [example code](tilt.py):
+* -:	G
+* (middle pin):	V
+* S:	D15

sensor-tilt/images/ky020.jpg

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+"""
+read state from tilt switch sensor using callback functions
+
+"""
+import RPi.GPIO as GPIO
+import time
+
+tiltPin = 15 # S connected to D15
+
+GPIO.setwarnings(False)
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(tiltPin, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
+
+lastState = GPIO.input(tiltPin)
+
+def eventTiltSwitch(e):
+	print("Tilted!")
+
+GPIO.add_event_detect(tiltPin, GPIO.BOTH, bouncetime = 200, callback = eventTiltSwitch)
+
+while(True):
+	time.sleep(0.1)
+	#print(GPIO.input(tiltPin))