Feature: Add new notification settings for user (#569)

Added new notification settings API for user 

Co-authored-by: Sojan Jose <sojan@pepalo.com>

spec/models/notification_setting_spec.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe NotificationSetting do
+  context 'with associations' do
+    it { is_expected.to belong_to(:account) }
+    it { is_expected.to belong_to(:user) }
+  end
+end