ADD db schema in models

app/models/fork_user.rb

@@ -1,3 +1,20 @@
+# == Schema Information
+#
+# Table name: fork_users
+#
+#  id              :integer          not null, primary key
+#  project_id      :integer
+#  fork_project_id :integer
+#  user_id         :integer
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#
+# Indexes
+#
+#  index_fork_users_on_project_id  (project_id)
+#  index_fork_users_on_user_id     (user_id)
+#
+
 class ForkUser < ApplicationRecord
   belongs_to :project
   belongs_to :user