Added best-practices section
Added best-practices section

`Handling multiple stages` and `Integrating external Services` is close
to being finalized and will be made available tomorrow

dalbhanj/kubernetes-aws-workshop,wombat/kubernetes-aws-workshop,dalbhanj/kubernetes-aws-workshop,dalbhanj/kubernetes-aws-workshop,arun-gupta/kubernetes-aws-workshop,dalbhanj/kubernetes-aws-workshop,arun-gupta/kubernetes-aws-workshop,arun-gupta/kubernetes-aws-workshop,arun-gupta/kubernetes-aws-workshop