Add FastAPI backend and React frontend setup with initial routes and components

frontend/src/App.js

@@ -0,0 +1,24 @@
+import { useState, useEffect } from 'react'
+
+function App() {
+  const [items, setItems] = useState([])
+
+  useEffect(() => {
+    fetch('http://localhost:8000/api/items')
+      .then(response => response.json())
+      .then(data => setItems(data))
+  }, [])
+
+  return (
+    <div className="App">
+      <h1>React + FastAPI Template</h1>
+      <ul>
+        {items.map((item, index) => (
+          <li key={index}>{item.name}</li>
+        ))}
+      </ul>
+    </div>
+  )
+}
+
+export default App

frontend/src/index.js

@@ -0,0 +1,9 @@
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+import App from './App'
+
+ReactDOM.createRoot(document.getElementById('root')).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+)