add annotate gem

spec/models/admin_user_spec.rb

@@ -1,4 +1,23 @@
 # frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: admin_users
+#
+#  id                     :bigint           not null, primary key
+#  email                  :string           default(""), not null
+#  encrypted_password     :string           default(""), not null
+#  remember_created_at    :datetime
+#  reset_password_sent_at :datetime
+#  reset_password_token   :string
+#  created_at             :datetime         not null
+#  updated_at             :datetime         not null
+#
+# Indexes
+#
+#  index_admin_users_on_email                 (email) UNIQUE
+#  index_admin_users_on_reset_password_token  (reset_password_token) UNIQUE
+#
 require "rails_helper"
 
 RSpec.describe(AdminUser, type: :model) do