Added basic frontend router structure.

01-frontend/src/App.tsx

@@ -1,35 +1,26 @@
-import { useState } from 'react'
-import reactLogo from './assets/react.svg'
-import viteLogo from '/vite.svg'
+import { BrowserRouter, Route, Routes } from 'react-router-dom'
 import './App.css'
+import Home from './pages/Home'
+import NoPage from './pages/NoPage';
+import NavBar from './helper/NavBar';
+import ReactDOM from 'react-dom/client';
 
-function App() {
-  const [count, setCount] = useState(0)
+export default function App() {
 
   return (
     <>
-      <div>
-        <a href="https://vite.dev" target="_blank">
-          <img src={viteLogo} className="logo" alt="Vite logo" />
-        </a>
-        <a href="https://react.dev" target="_blank">
-          <img src={reactLogo} className="logo react" alt="React logo" />
-        </a>
-      </div>
-      <h1>Vite + React</h1>
-      <div className="card">
-        <button onClick={() => setCount((count) => count + 1)}>
-          count is {count}
-        </button>
-        <p>
-          Edit <code>src/App.tsx</code> and save to test HMR!
-        </p>
-      </div>
-      <p className="read-the-docs">
-        Click on the Vite and React logos to learn more
-      </p>
+      <NavBar />
+      <BrowserRouter>
+        <Routes>
+          <Route path="/">
+            <Route index element={<Home />} />
+            <Route path="*" element={<NoPage />} />
+          </Route>
+        </Routes>
+      </BrowserRouter>
     </>
   )
 }
 
-export default App
+const root = ReactDOM.createRoot(document.getElementById('root') as HTMLElement);
+root.render(<App />);

01-frontend/src/helper/ItemCard.tsx

@@ -0,0 +1,6 @@
+export default function ItemCard() {
+    return (
+        <div >
+        </div>
+    )
+}

01-frontend/src/helper/NavBar.tsx

@@ -0,0 +1,11 @@
+export default function NavBar() {
+    return (
+        <nav>
+            <ul>
+                <li><a href="/">Home</a></li>
+                <li><a href="/about">About</a></li>
+                <li><a href="/contact">Contact</a></li>
+            </ul>
+        </nav>
+    )
+}

01-frontend/src/pages/Home.tsx

@@ -0,0 +1,8 @@
+export default function Home() {
+    return (
+        <div>
+            <h1>Home</h1>
+            <p>Welcome to the home page!</p>
+        </div>
+    )
+}

01-frontend/src/pages/NoPage.tsx

@@ -0,0 +1,8 @@
+export default function NoPage() {
+    return (
+        <div>
+            <h1>404 Not Found</h1>
+            <p>The page you are looking for does not exist.</p>
+        </div>
+    )
+}