Update index.pt.html

Added Spanish link

assets/index.pt.html

@@ -33,6 +33,10 @@
 	<a href="index.pt.html">
 	  Português
 	</a>
+	/
+	<a href="index.es.html">
+	  Español
+	</a>
       </div>
       <p>Single-Image Super-Resolution for Anime-Style Art using Deep Convolutional Neural Networks. And it supports photo.</p>
       <p class="margin1 link-box">