Add some screen shots

Author: rocky

index.html

@@ -41,10 +41,20 @@ <h2>
       <!-- <ul id="mirrors"> -->
       <!-- </ul> -->
 
+      <h2>
+      <a id="screenshots" class="anchor" href="#screenshots" aria-hidden="true"><span class="octicon octicon-link"></span></a>Screenshots</h2>
+
+      <h3>mathicsscript: a text interface</h3>
+
+      <p><img src="screenshots/mathicsscript.png"></p>
+
+      <h3>mathicsserver: a Django-based Web interface</h3>
+      <p><img src="screenshots/mathicsserver.png"></p>
+
       <h2>
       <a id="download-and-install-mathics" class="anchor" href="#download-and-install-mathics" aria-hidden="true"><span class="octicon octicon-link"></span></a>Download and install Mathics</h2>
 
-      <p><a href="https://github.com/mathics/Mathics/">Github</a></p>
+      <p><a href="https://github.com/mathics/">Github mathics Organization</a></p>
 
       <p><a href="https://github.com/mathics/Mathics/wiki/Installing-and-Running">Installation and Running Guide</a></p>