modify userModel properties

api/models/userModel.js

@@ -4,11 +4,14 @@ var mongoose = require('mongoose');
 var Schema = mongoose.Schema;
 
 var UserSchema = new Schema({
-    // TODO modify later, just for testing 
+    // TODO additional fields may be added 
-    name: {
+    username: {
         type: String,
         required: 'Name'
     },
+    email: {
+        type: String
+    },
     Created_date: {
         type: Date,
         default: Date.now