[readme] added some info
[readme] added some info

* added information that wasnt clear to me to start with
this might help people get ramped faster

mdsummers/pkgcloud,dionjwa/pkgcloud,Hopebaytech/pkgcloud,temka1234/pkgcloud,hacor/pkgcloud,Phanatic/pkgcloud,songanbui/pkgcloud,DonSchenck/pkgcloud,pkgcloud/pkgcloud,Phanatic/pkgcloud,andrewsomething/pkgcloud,bunglestink/pkgcloud,mcanthony/pkgcloud,apla/pkgcloud