created base structure of admin page

app/admin/articles/create/page.tsx

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+import React from "react";
+
+export default function AdminArticlesCreate() {
+  return (
+    <div>
+      <h1>Create a new article</h1>
+    </div>
+  );
+}

app/admin/articles/page.tsx

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+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;

app/admin/categories/create/page.tsx

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+import React from "react";
+
+export default function AdminCategoriesCreate() {
+  return (
+    <div>
+      <h1>Create a new category</h1>
+    </div>
+  );
+}

app/admin/categories/page.tsx

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+import React from "react";
+
+export default function AdminCategoriesPage() {
+  return (
+    <div>
+      <h1>Page to manage categories</h1>
+      <a href="/admin/categories/create">create new category</a> <br />
+      <p>List of existing category</p>
+    </div>
+  );
+}

app/admin/page.tsx

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+import React from "react";
+
+export default function AdminPage() {
+  return (
+    <div>
+      <h1>AdminPage to manage explainegy</h1>
+      <a href="/admin/articles/">articles</a> <a href="/admin/categories/">categories</a> <br />
+    </div>
+  );
+}