Added data download ability

frontend/src/App.tsx

@@ -0,0 +1,20 @@
+import React from 'react';
+import { BrowserRouter as Router, Route, Routes } from 'react-router-dom';
+import Login from './components/LoginPage';
+import ProtectedRoute from './components/ProtectedRoute';
+import SignDetailpage from './components/SignDetailPage';
+import SignsPage from './components/SignsPage';
+
+function App() {
+  return (
+    <Router>
+      <Routes>
+        <Route path="/" element={<ProtectedRoute><SignsPage /></ProtectedRoute>} />
+        <Route path="/login" element={<Login />} />
+        <Route path="/signs/:id" element={<ProtectedRoute><SignDetailpage /></ProtectedRoute>} />
+      </Routes>
+    </Router>
+  );
+}
+
+export default App;