Add servo example, servo action is jerky but functional

crawler_software/servo_test.py

@@ -0,0 +1,19 @@
+import RPi.GPIO as GPIO
+import time
+
+servoPIN = 17
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(servoPIN, GPIO.OUT)
+
+p = GPIO.PWM(servoPIN, 50) # GPIO 17 for PWM with 50Hz
+p.start(2.5) # Initialization
+try:
+  while True:
+    p.ChangeDutyCycle(10)
+    time.sleep(2)
+    p.ChangeDutyCycle(2.5)
+    time.sleep(2)
+except KeyboardInterrupt:
+  p.stop()
+  GPIO.cleanup()
+