Intro quiz added.

Energiesysteme.md

@@ -15,9 +15,8 @@ attribute: License: [CC BY-SA](https://creativecommons.org/licenses/by-sa/4.0/)
 
 comment:   This small course on energy systems and ecology is part
            of the collaborative module »Technologie und Ökologie« in
-		   the master programme »Nachhaltige Transformationsgestal-
-		   tung« at the University of Applied Sciences Münster.
-		  
+           the master programme »Nachhaltige Transformationsgestal-
+           tung« at the University of Applied Sciences Münster.
 -->
 
 # Energie und Ökologie