added sitemap & robots.txt

frontend/public/robots.txt

@@ -0,0 +1,6 @@
+# Robots.txt for cimaprogetti.it
+User-agent: *
+Allow: /
+
+# Sitemap
+Sitemap: https://cimaprogetti.it/sitemap.xml

frontend/src/app/sitemap.ts

@@ -0,0 +1,20 @@
+import { MetadataRoute } from 'next'
+
+export default function sitemap(): MetadataRoute.Sitemap {
+  const baseUrl = 'https://cimaprogetti.it'
+
+  return [
+    {
+      url: `${baseUrl}`,
+      lastModified: new Date(),
+      changeFrequency: 'weekly',
+      priority: 1,
+    },
+    {
+      url: `${baseUrl}/contatti`,
+      lastModified: new Date(),
+      changeFrequency: 'monthly',
+      priority: 0.8,
+    },
+  ]
+}