created base structure of admin page

app/admin/articles/page.tsx

@@ -0,0 +1,13 @@
+import React from "react";
+
+function AdminArticlesPage() {
+  return (
+    <div>
+      <h1>Page to manage articles</h1>
+      <a href="/admin/articles/create">create new article</a> <br />
+      <p>List of existing articles</p>
+    </div>
+  );
+}
+
+export default AdminArticlesPage;