Add link to the mathicsscript screenshot directory

Author: rocky

index.html

@@ -48,6 +48,8 @@ <h3>mathicsscript: a text interface</h3>
 
       <p><img src="screenshots/mathicsscript.png"></p>
 
+      <p>For animated demos, see the <a href="https://github.com/Mathics3/mathicsscript/tree/master/screenshots">mathics screenshot directory</a>.</p>
+
       <h3>mathicsserver: a Django-based Web interface</h3>
       <p><img src="screenshots/mathicsserver.png"></p>