add main component

.ruby-version

@@ -1 +1 @@
-ruby-3.0.0
+ruby-3.0.1

app/controllers/static_controller.rb

@@ -0,0 +1,6 @@
+class StaticController < ApplicationController
+
+  def index
+  end
+
+end

app/javascript/components/HelloWorld.js

@@ -0,0 +1,10 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+
+export default function HelloWorld({ greeting }) {
+  return <>Greeting: {greeting} </>;
+}
+
+HelloWorld.propTypes = {
+  greeting: PropTypes.string
+};

app/views/static/index.haml

@@ -0,0 +1,3 @@
+= javascript_pack_tag 'application'
+
+= react_component("HelloWorld", { greeting: "Hello" })

config/routes.rb

@@ -1,3 +1,9 @@
 Rails.application.routes.draw do
   # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
+  root 'static#index'
+
+  namespace :v1, default: { format: :json } do
+    #get :things, to: 'things'
+  end
+
 end