add status page to php module overview

Author: gregor-j

php-modules.md

@@ -8,6 +8,8 @@ Author                  | Module      | supported PHP versions | PHP/SAP compose
 [Piers Haring][harding] | `sapnwrfc`  | PHP 5.x                | `phpsap/saprfc-harding`
 [Gregor Kralik][kralik] | `sapnwrfc`  | PHP 7.x                | `phpsap/saprfc-kralik`
 
+See the [status page](status) on build status, the code quality and the test coverage. 
+
 [koucky]: http://saprfc.sourceforge.net/ "SAPRFC extension module for PHP"
 [harding]: https://github.com/piersharding/php-sapnwrfc "SAP RFC Connector using the SAP NW RFC SDK for PHP"
 [kralik]: https://github.com/gkralik/php7-sapnwrfc "SAP NW RFC SDK extension for PHP7"