[readme] added client instantiation
[readme] added client instantiation

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