enquete class documentation + a bit of the others

server/web-data-connection/sensorNodeClassFile.md

@@ -9,6 +9,11 @@ import json
 #Import classes and functions from different files.
 from classes_data import Node
 from classes_data import dbLogin
+```
+After this the "__init__"function is called. 
+(In javascript this is known as the "constructor".
+For further information visit https://www.w3schools.com/python/gloss_python_class_init.asp)
+```py
 #A class to send data to the database. child class of "Node"
 class SensorNode(Node):
     #A private query only to be used in this class.