add new files

api/models/groupModel.js

@@ -0,0 +1,16 @@
+'use strict';
+
+var mongoose = require('mongoose');
+var Schema = mongoose.Schema;
+
+var GroupSchema = new Schema({
+    // TODO additional fields may be added 
+    name: {
+        type: String
+    },
+    // TODO figure out those two below 
+    permissons:[],
+    users: []
+});
+
+module.exports = mongoose.model('Group', GroupSchema);