improved measurement file and added storage in resources

resources/storage.py

@@ -5,6 +5,10 @@ Created on Thu May  2 17:56:49 2019
 
 Class for handling data saving.
 
+For now, this is how it works: you choose a directory and you create a Storage object with the directory as input. 
+Then, the method create_data_file creates a data file in dump, to which append_data_to_current_file can be used to load data 
+into it. That lies in the dump, and can me made permanent with permanent_save_current_data. 
+
 @author: martindrech
 """