Add section about cvsgrab

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@113199 13f79535-47bb-0310-9956-ffa450edef68

xdoc/src/plugin-resources/templates/cvs-usage.xml

@@ -61,6 +61,17 @@
       </p>
 
     </section>
+
+    <section name="CVS Access behind a firewall">
+
+      <p>
+        For those developers who are stuck behind a corporate
+        firewall, <a href="http://cvsgrab.sourceforge.net/">CVSGrab</a>
+        can use the viewcvs web interface to checkout the source code.
+      </p>
+
+    </section>
+
     #end
   </body>