Add notes for creating disk options
Add notes for creating disk options

chrisroberts/vagrant,mitchellh/vagrant,mitchellh/vagrant,marxarelli/vagrant,mitchellh/vagrant,marxarelli/vagrant,chrisroberts/vagrant,sni/vagrant,chrisroberts/vagrant,sni/vagrant,sni/vagrant,marxarelli/vagrant,mitchellh/vagrant,sni/vagrant,chrisroberts/vagrant,marxarelli/vagrant