added signup and signin pages

app/(auth)/(routes)/sign-in/[[...sign-in]]/page.tsx

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+import { SignIn } from "@clerk/nextjs";
+ 
+export default function Page() {
+  return <SignIn />;
+}

app/(auth)/(routes)/sign-up/[[...sign-up]]/page.tsx

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+import { SignUp } from "@clerk/nextjs";
+ 
+export default function Page() {
+  return <SignUp />;
+}

app/(auth)/layout.tsx

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+const AuthLayout = ({ children }: { children: React.ReactNode}) => {
+    return ( 
+        <div className="h-full flex items-center justify-center">
+            {children}
+        </div>
+     );
+}
+ 
+export default AuthLayout;