Add adsense.

index.html

@@ -48,7 +48,16 @@
 <li><a href="#design">Design</a></li>
 </ul>
 
-
+<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
+<!-- github test -->
+<ins class="adsbygoogle"
+     style="display:block"
+     data-ad-client="ca-pub-6257235311495423"
+     data-ad-slot="6950223342"
+     data-ad-format="auto"></ins>
+<script>
+(adsbygoogle = window.adsbygoogle || []).push({});
+</script>