feat: add stage 0 foundation

frontend/src/main.tsx

@@ -0,0 +1,11 @@
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+
+import { App } from './app/App'
+import './styles/globals.css'
+
+ReactDOM.createRoot(document.getElementById('root')!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+)