added middleware for admin page

src/app/admin/page.tsx

@@ -0,0 +1,7 @@
+import React from 'react'
+
+export default function page() {
+  return (
+    <div>Admin Page</div>
+  )
+}

src/middleware.ts

@@ -0,0 +1,21 @@
+import { NextResponse } from "next/server";
+import type { NextRequest } from "next/server";
+export { default } from "next-auth/middleware";
+import { getToken } from "next-auth/jwt";
+
+// This function can be marked `async` if using `await` inside
+export async function middleware(request: NextRequest) {
+  const token = await getToken({ req: request });
+  const url = request.nextUrl;
+
+  if (url.pathname === "/admin") {
+    if (token?.role!=="ADMIN") {
+      return NextResponse.redirect(new URL("/", request.url));
+    }
+  }
+}
+
+// See "Matching Paths" below to learn more
+export const config = {
+  matcher: ["/:path*", "/"],
+};