Add annotate_rb gem and annotate all models

test/fixtures/contestants.yml

@@ -1,5 +1,24 @@
 # Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
 
+# == Schema Information
+#
+# Table name: contestants
+#
+#  id         :integer          not null, primary key
+#  email      :string
+#  name       :string
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  contest_id :integer          not null
+#
+# Indexes
+#
+#  index_contestants_on_contest_id  (contest_id)
+#
+# Foreign Keys
+#
+#  contest_id  (contest_id => contests.id)
+#
 one:
   name: MyString
   email: MyString