add play button for gallery

_includes/gallery.html

@@ -15,10 +15,15 @@
 			{% if image_extensions contains image_ext %}
 				{% if image_path contains gallery_prefix %}
 					{% assign image_index = image_index | plus: 1 %}
-					<img id="{{ gallery_name}}-{{ image_index }}" src="{{ site.baseurl }}{{ image_path }}" />
+					<img id="{{ gallery_name }}-{{ image_index }}" src="{{ site.baseurl }}{{ image_path }}" />
 				{% endif %}
 			{% endif %}
 		{% endfor %}
 	</div>
-	<nav></nav>
+	<nav>
+		<div class="play">
+			<input type="checkbox" value="" id="{{ gallery_name }}-play" />
+			<label for="{{ gallery_name }}-play"></label>
+		</div>
+	</nav>
 </div>