Added sitemap.

app/sitemap.ts

@@ -0,0 +1,39 @@
+// https://searchengineland.com/microsoft-bing-to-rely-more-on-lastmod-date-in-xml-sitemap-files-for-crawling-392491
+
+
+import { getSortedPostsData } from '@/lib/posts'
+import { MetadataRoute } from 'next';
+
+
+const URL = "https://www.tetmon.com";
+
+
+export default function sitemap(): MetadataRoute.Sitemap {
+  const posts = getSortedPostsData();
+  return [
+    {
+      url: URL,
+      lastModified: new Date(),
+      changeFrequency: 'yearly' as const,
+      priority: 1,
+    },
+    {
+      url: `${URL}/about`,
+      lastModified: new Date(),
+      changeFrequency: 'monthly' as const,
+      priority: 0.8,
+    },
+    {
+      url: `${URL}/blog`,
+      lastModified: new Date(),
+      changeFrequency: 'weekly' as const,
+      priority: 1,
+    },
+    ...posts.map((post) => ({
+      url: `${URL}/blog/${post.id}`,
+      lastModified: new Date(post.date),
+      changeFrequency: 'weekly' as const,
+      priority: 0.9,
+    })),
+  ]
+}