Add annotate_rb gem and annotate all models

app/models/contest.rb

@@ -1,3 +1,23 @@
+# == Schema Information
+#
+# Table name: contests
+#
+#  id                 :integer          not null, primary key
+#  allow_registration :boolean          default(FALSE)
+#  name               :string
+#  team               :boolean          default(FALSE)
+#  created_at         :datetime         not null
+#  updated_at         :datetime         not null
+#  user_id            :integer          not null
+#
+# Indexes
+#
+#  index_contests_on_user_id  (user_id)
+#
+# Foreign Keys
+#
+#  user_id  (user_id => users.id)
+#
 class Contest < ApplicationRecord
   belongs_to :user