creating layout

src/sitemap.njk

@@ -0,0 +1,12 @@
+---
+permalink: /sitemap.xml
+eleventyExcludeFromCollections: true
+---
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+{%- for entry in collections.all -%}
+  <url>
+    <loc>{{ site.url }}{{ entry.url }}</loc>
+  </url>
+{%- endfor -%}
+</urlset>