Add rewrite test as method to vc

Change-Id: I87ac48fdbf9d4c75ce09c4456460d1ede56b9034
diff --git a/dev/js/src/vc/docgroupref.js b/dev/js/src/vc/docgroupref.js
index f1c1851..905faf8 100644
--- a/dev/js/src/vc/docgroupref.js
+++ b/dev/js/src/vc/docgroupref.js
@@ -9,6 +9,9 @@
   'util'
 ], function (jsonldClass, rewriteListClass, stringValClass) {
 
+  // TODO:
+  //   Does not support rewrites currently
+  
   const loc = KorAP.Locale;
   loc.EMPTY = loc.EMPTY || '⋯';