Add json-mode group

Author: notetiene

json-mode.el

@@ -1,4 +1,4 @@
-;;; json-mode.el --- Major mode for editing JSON files
+;;; json-mode.el --- Major mode for editing JSON files.
 
 ;; Copyright (C) 2011-2014 Josh Johnston
 
@@ -31,6 +31,10 @@
 (require 'json-snatcher)
 (require 'json-reformat)
 
+(defgroup json-mode '()
+  "Major mode for editing JSON files."
+  :group 'js)
+
 (defconst json-mode-quoted-string-re
   (rx (group (char ?\")
              (zero-or-more (or (seq ?\\ ?\\)