add comments

Signed-off-by: Michael Leuschel <leuschel@uni-duesseldorf.de>

Jars/Jars.json

 {
   "svg":"Jars.svg",
+  "comment": "VisB Visualization for Jars by Jonas Erdmann",
   "items": [
   {
   	"id": "jar_%0_full",

Jars/Jars.svg

+<!--svg for Jars by Jonas Erdmann-->
 <svg width="360" height="360"
   xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">