docs(README): update README with basic information
docs(README): update README with basic information

The README reflected an earlier stage of project development. This
update gives more useful "Why Helm?" documentation at the top, and
updates several of the instructions to be more reflective of current
status.

flynnduism/helm,yan234280533/helm,technosophos/k8s-helm,michelleN/deployment-manager,SlickNik/helm,adamreese/helm,iamzhout/helm,vaikas-google/deployment-manager,technosophos/deployment-manager,sushilkm/helm,iamzhout/helm,qwangrepos/helm,helm/helm,flynnduism/helm,adamreese/helm,jascott1/helm,FengyunPan/helm,helm/helm,jascott1/helm,michelleN/deployment-manager,fibonacci1729/helm,kdada/helm,appscode/helm,adamreese/deployment-manager,qwangrepos/helm,technosophos/deployment-manager,technosophos/deployment-manager,technosophos/k8s-helm,rbwsam/helm,michelleN/deployment-manager,technosophos/deployment-manager,vaikas-google/deployment-manager,technosophos/deployment-manager,eicnix/helm,adamreese/deployment-manager,yan234280533/helm,michelleN/deployment-manager,FengyunPan/helm,thomastaylor312/helm,SlickNik/helm,bradj/helm,fibonacci1729/helm,bacongobbler/helm,appscode/helm,thomastaylor312/helm,bradj/helm,adamreese/deployment-manager,bacongobbler/helm,sushilkm/helm,eicnix/helm,rbwsam/helm,adamreese/deployment-manager,adamreese/deployment-manager,kdada/helm