Add link to DoliStore.com

doc/index.html

@@ -18,6 +18,8 @@ on Internet on web following sites:<br>
 * <a href="http://demo.dolibarr.org/public/demo/">Dolibarr demo</a><br>
 <br>
 * <a href="http://www.nltechno.com/pages/dolibarrwinbin.php">DoliWamp, the Dolibarr for Windows</a><br>
+<br>
+* <a href="http://www.dolistore.com/">DoliStore, the official addons/plugins market place</a><br>
 
 </body>
 </html>
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