hello_appの設定追加

app/controllers/application_controller.rb

@@ -1,2 +1,5 @@
 class ApplicationController < ActionController::Base
+    def hello
+        render html: "こんにちは、るびぃ"
+    end
 end

config/routes.rb

@@ -1,6 +1,3 @@
 Rails.application.routes.draw do
-  # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
-
-  # Defines the root path route ("/")
-  # root "articles#index"
-end
+  root "application#hello"
+end