Add useage for how to extract and open files from an archieve.

source/2/2.4/2.4.1/ARK.rst

@@ -16,6 +16,10 @@ Screenshot
 .. image:: ARK.png
  :width 80%: 
 
+Useage
+------
+To open a file in a archieve double click it after open it in the archieve or single click the file and press open. If you want to extract or move a file out of the archieve press the piece of paper with an upward pointed arrow that says extract.  
+
 Version
 -------
 Lubuntu ships version 4:18.04.3 of ARK.