Sign in screen with token retrieval

client/src/App.tsx

@@ -1,12 +1,14 @@
 import { Route, Routes } from "react-router-dom";
 import HomePage from "./pages/HomePage";
 import SignUpPage from "./pages/SignUpPage";
+import SignInPage from "./pages/SignInPage";
 
 function App() {
   return (
     <Routes>
       <Route element={<HomePage />} path="/" />
       <Route element={<SignUpPage />} path="/signup" />
+      <Route element={<SignInPage />} path="/signin" />
     </Routes>
   );
 }