Add annotate_rb gem and annotate all models

app/models/user.rb

@@ -1,3 +1,19 @@
+# == Schema Information
+#
+# Table name: users
+#
+#  id              :integer          not null, primary key
+#  admin           :boolean          default(FALSE), not null
+#  email_address   :string           not null
+#  password_digest :string           not null
+#  username        :string
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#
+# Indexes
+#
+#  index_users_on_email_address  (email_address) UNIQUE
+#
 class User < ApplicationRecord
   has_many :contests, dependent: :destroy
   has_many :sessions, dependent: :destroy