Added addCard to DispenseInterface

VendServer/DispenseInterface.py

@@ -28,6 +28,12 @@ class DispenseInterface(object):
 	def authMifare(cardId):
 		pass
 
+	"""
+	Add a MIFARE card for this user
+	"""
+	def addCard(self, cardId):
+		pass
+
 	"""
 	Check if creating the user worked correctly.
 	"""