clerk sign in and sign up login setup

app/index.tsx

@@ -1,6 +1,11 @@
+import { useAuth } from "@clerk/clerk-expo";
 import { Redirect } from "expo-router";
 
 const App = () => {
+  const { isSignedIn } = useAuth();
+
+  if (isSignedIn) return <Redirect href="/(root)/(tabs)/home" />;
+
   return <Redirect href="/(auth)/welcome" />;
 };