Update README.md with usage and known issues.
Update README.md with usage and known issues.

dlorenc/minikube,endocode/minikube,kubernetes/minikube,dlorenc/minikube,dongsupark/minikube,warmchang/minikube,warmchang/minikube,abbytiz/minikube,jimmidyson/minishift,LalatenduMohanty/minishift,minishift/minishift,kubernetes/minikube,dlorenc/minikube,aaron-prindle/minikube,cu12/minikube,skipjaq/minikube,warmchang/minikube,praveenkumar/minishift,luxas/minikube,endocode/minikube,budhrg/minishift,LalatenduMohanty/minishift,mikegrass/minikube,mikegrass/minikube,r2d4/minikube,luxas/minikube,r2d4/minikube,warmchang/minikube,kubernetes/minikube,jimmidyson/minishift,kubernetes/minikube,r2d4/minikube,warmchang/minikube,dims/minikube,Preeticp/minishift,thatdocslady/minishift,dalehamel/minikube,aaron-prindle/minikube,abbytiz/minikube,Preeticp/minishift,dongsupark/minikube,thatdocslady/minishift,abbytiz/minikube,dalehamel/minikube,minishift/minishift,aaron-prindle/minikube,dims/minikube,thatdocslady/minishift,mikegrass/minikube,dlorenc/minikube,praveenkumar/minishift,dims/minikube,warmchang/minikube,skipjaq/minikube,Preeticp/minishift,budhrg/minishift,warmchang/minikube,dlorenc/minikube,LalatenduMohanty/minishift,endocode/minikube,kubernetes/minikube,kubernetes/minikube,minishift/minishift,dongsupark/minikube,budhrg/minishift,skipjaq/minikube,kubernetes/minikube,jimmidyson/minishift,dlorenc/minikube,dalehamel/minikube,praveenkumar/minishift,dlorenc/minikube,dlorenc/minikube,cu12/minikube,cu12/minikube