Added models

models/Notifications.js

@@ -0,0 +1,14 @@
+module.exports = mongoose => {
+  const schema = new mongoose.Schema({
+    user: String,
+    property: {
+      type: String,
+      enum: ['artist', 'title']
+    },
+    value: String
+  })
+
+  const Notifications = mongoose.model('Notifications', schema)
+
+  return Notifications
+}