Add example command using common ldap client

[cvgw]

I think it would be very useful to new users to have an example search using a common tool like ldapsearch.

Something like

$ ldapsearch -x -h localhost -p 3004 -b "dc=test" "(&(objectclass=person)(cn=user-login))"

I think adding this to the README would help clear up confusion for new users.

[maxime-beguin]

@cvgw: thank you for the advice, an example has been added to the README.md file in branch develop. It will be released soon.

[maxime-beguin]

Released.