Added CLI Configuration Example

[sluetze]

fixes #199

[zorn-v]

docker exec -t -u33 $containername

-u33 - is www-data user ONLY FOR debian based images. In alpine it is uid=82(www-data), so correctly will be -uwww-data. Also there is no bash preinstalled in alpine images, so docker exec -it -uwww-data $containername sh will be more correct

[zorn-v]

Thanks