Add hello

Author: khin-alu

app/controllers/application_controller.rb

@@ -1,4 +1,8 @@
 class ApplicationController < ActionController::Base
   # Only allow modern browsers supporting webp images, web push, badges, import maps, CSS nesting, and CSS :has.
   allow_browser versions: :modern
+
+  def hello
+    render html: "hello, world!"
+  end
 end

config/environments/development.rb

@@ -1,6 +1,7 @@
 require "active_support/core_ext/integer/time"
 
 Rails.application.configure do
+  config.hosts.clear
   # Settings specified here will take precedence over those in config/application.rb.
 
   # Make code changes take effect immediately without server restart.

config/routes.rb

@@ -10,5 +10,5 @@
   # get "service-worker" => "rails/pwa#service_worker", as: :pwa_service_worker
 
   # Defines the root path route ("/")
-  # root "posts#index"
+  root "application#hello"
 end