Add ActionController template

lib/templates/rails/controller/controller.rb.tt

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+<% if namespaced? -%>
+require_dependency "<%= namespaced_path %>/application_controller"
+
+<% end -%>
+<% module_namespacing do -%>
+class <%= class_name %>Controller < ApplicationController
+<% actions.each do |action| -%>
+  def <%= action %>
+  end
+<%= "\n" unless action == actions.last -%>
+<% end -%>
+end
+<% end -%>