add: template setting model

app/models/user_template_message_setting.rb

@@ -0,0 +1,18 @@
+# == Schema Information
+#
+# Table name: user_template_message_settings
+#
+#  id                :integer          not null, primary key
+#  user_id           :integer
+#  notification_body :text(65535)
+#  email_body        :text(65535)
+#  created_at        :datetime         not null
+#  updated_at        :datetime         not null
+#
+# Indexes
+#
+#  index_user_template_message_settings_on_user_id  (user_id)
+#
+
+class UserTemplateMessageSetting < ApplicationRecord
+end