add docs/ to generate github page

docs/sitemap.xml

@@ -0,0 +1,24 @@
+---
+layout: none
+search: exclude
+---
+
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+  {% for post in site.posts %}
+  {% unless post.search == "exclude" %}
+  <url>
+    <loc>{{site.url}}{{post.url}}</loc>
+  </url>
+  {% endunless %}
+  {% endfor %}
+
+
+  {% for page in site.pages %}
+  {% unless page.search == "exclude" %}
+  <url>
+    <loc>{{site.url}}{{ page.url}}</loc>
+  </url>
+  {% endunless %}
+  {% endfor %}
+</urlset>