add calculator example

scheme/httpd/surflets/web-server/root/htdocs/index.html

@@ -10,6 +10,7 @@
       <li><a href="servlet/news.scm">News</a></li>
       <li><a href="servlet/add.scm">Adding (version 1)</a></li>
       <li><a href="servlet/add2.scm">Adding (version 2)</a></li>
+      <li><a href="servlet/calculate.scm">Simple Calculator</a></li>
 <!--       <li><a href=/servlet/test.scm>A test servlet</a></li> -->
       <li><a href=index.html>This file</a></li>
     </ul>
@@ -19,7 +20,7 @@
     <hr>
     <!-- Created: Thu Aug 22 16:44:16 CEST 2002 -->
     <!-- hhmts start -->
-Last modified: Tue Sep 24 11:13:29 CEST 2002
+Last modified: Fri Sep 27 17:34:58 CEST 2002
 <!-- hhmts end -->
   </body>
 </html>