Update README.rdoc
Update README.rdoc

Updated app description.
PHCNetworks/multi-tenancy-warden,PHCNetworks/multi-tenancy-warden,CoastDigitalGroup/cdg-subengine-warden,CoastDigitalGroup/cdg-subengine-warden,CoastDigitalGroup/cdg-subengine-warden,PHCNetworks/multi-tenancy-warden