Add reference to Mantle demo

Overv · Overv · commit 1b4fef48db5e · 2015-04-21T15:48:56.000Z
diff --git a/index.html b/index.html
@@ -90,6 +90,12 @@ <h1>API</h1>
                 sources.
             </p>
 
+            <p>
+                The author of this website has figured out how to implement
+                Hello Triangle using Mantle, which Vulkan is based on. You can
+                find more information about it <a href="https://medium.com/@Overv/implementing-hello-triangle-in-mantle-4302450fbcd2">here</a>.
+            </p>
+
             The blog post linked above offers some insight. API calls have the
             <code>vk</code> prefix and functions take the state that they will
             change as their first parameter.
