Created Custom Buzzer (markdown)

Custom-Buzzer.md

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+Example Code for Custom Buzzer 
+```
+from modules import cbpi
+
+class MyBuzzer(object):
+    def beep(self):
+        print "#########################  PLAY MY SOUND"
+
+@cbpi.initalizer(order=-1)
+def init(cbpi):
+    print "############## INIT BUZZER"
+    cbpi.buzzer = MyBuzzer()
+    print "INIT BUZZER"
+```