Update README.rdoc
Update README.rdoc

Add more instructions.
CoastDigitalGroup/cdg-subengine-warden,PHCNetworks/multi-tenancy-warden,PHCNetworks/multi-tenancy-warden,PHCNetworks/multi-tenancy-warden,CoastDigitalGroup/cdg-subengine-warden,CoastDigitalGroup/cdg-subengine-warden