Use Rails plugin generator and adapt

bin/rails

@@ -0,0 +1,24 @@
+#!/usr/bin/env ruby
+# This command will automatically be run when you run "rails" with Rails gems
+# installed from the root of your application.
+
+ENGINE_ROOT = File.expand_path('..', __dir__)
+ENGINE_PATH = File.expand_path('../lib/crono/engine', __dir__)
+
+# Set up gems listed in the Gemfile.
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
+require 'bundler/setup' if File.exist?(ENV['BUNDLE_GEMFILE'])
+
+require 'rails'
+# Pick the frameworks you want:
+require 'active_model/railtie'
+require 'active_job/railtie'
+require 'active_record/railtie'
+require 'active_storage/engine'
+require 'action_controller/railtie'
+require 'action_mailer/railtie'
+require 'action_view/railtie'
+require 'action_cable/engine'
+# require "sprockets/railtie"
+# require "rails/test_unit/railtie"
+require 'rails/engine/commands'