README - added specimen header

README.md

@@ -25,6 +25,8 @@ Frequently asked questions are answered in our [FAQ](FAQ.md).
 * [License](#license)
 
 
+### Specimen
+
 <a href="http://source-foundry.github.io/Hack/font-specimen.html"><img src="img/hack-specimen-2.png" alt="Hack &mdash; a typeface designed for source code" width="728"></a>
 
 ## Overview of features