Add routing

client/src/App.tsx

@@ -1,7 +1,19 @@
+import { Route, Routes } from 'react-router';
+
+import Home from 'pages/Home';
+import Languages from 'pages/Languages';
 import Typing from 'pages/Typing';
+import NotFound from 'pages/NotFound';
 
 function App() {
-  return <Typing />;
+  return (
+    <Routes>
+      <Route index element={<Home />} />
+      <Route path='languages' element={<Languages />} />
+      <Route path='typing/:lang' element={<Typing />} />
+      <Route path='*' element={<NotFound />} />
+    </Routes>
+  );
 }
 
 export default App;