chore: update README.md for k8s

k8s/README-en.md

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+# Deploy services on Kubernetes
+
+In Kubernetes, the service consists of two components,
+
+1. Environments
+2. Applications
+
+And you can choose the storage in the application either NFS or Cinder provided by Openstack(used by [Pasta](http://paas-ta.kr))
+
+# Prerequisites
+
+## Install kustomize
+
+If you are using kubectl 1.14 or later, it embeded kustomize. So please ignore this section.
+I recommend that you install the latest version of [kubectl](https://kubectl.docs.kubernetes.io/installation/kubectl/) for your cluster instead of installing kustomize.
+Even so, if you want to use kustomize, refer to [official kustomize doc](https://kustomize.io/). 
+
+# Deploy service
+
+You must follow deployment order.
+
+## Deploy environments
+
+```sh
+$ kustomize build k8s/environments | kubectl apply -f -
+```
+or if you are using the kubectl only,
+
+```sh
+$ kubectl apply -k k8s/environments
+```
+
+## Deploy applications
+
+If you want to use NFS as a main storage,
+
+```sh
+$ kustomize build k8s/stoage/nfs | kubectl apply -f -
+```
+
+or
+
+```sh
+$ kubectl apply -k k8s/stoage/nfs
+```
+
+In case of using Openstack storage(CINDER) as a main storage,
+
+```sh
+$ kustomize build k8s/stoage/openstack | kubectl apply -f -
+```
+
+or
+
+```sh
+$ kubectl apply -k k8s/stoage/openstack
+```
+
+# Shutdown service
+
+Simply apply deployment in reverse order.
+
+If you are using nfs, 
+
+```sh
+$ kustomize build k8s/environments | kubectl delete -f -
+$ kustomize build k8s/stoage/nfs | kubectl delete -f -  --wait
+```
+
+or
+
+```sh
+$ kubectl delete -k k8s/environments
+$ kubectl delete -k k8s/stoage/nfs --wait
+```
+
+The case of openstack is similar, so it is omitted.