Add link to WantedPorts to handbook.

PR : docs/152852
Submitted by:	Eitan Adler <lists at eitanadler dot com>
Reviewed by:	Warren Block <wblock at wonkity dot com> (via freebsd-doc@)

en_US.ISO8859-1/books/porters-handbook/book.sgml

@@ -86,6 +86,12 @@
 	  typing <command>:set tabstop=4</command> once the file has been
 	  loaded.</para>
       </note>
+
+      <para>
+        Looking for something easy to start with? Take a look at the
+        <ulink url="http://wiki.freebsd.org/WantedPorts">list of
+	  requested ports</ulink> and see if you can work on one (or more).
+      </para>
     </chapter>
 
     <chapter id="quick-porting">