docs: README.md file describing PROD deployment process added

kubescripts/README.md

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+# Kubernetes PROD Deployment
+
+This directory contains 3 shell scripts that are used when deploying the code to the production.
+
+As with the DEV environment, it is necessary to first build Docker images using the command `docker-compose build`.
+However, unlike the DEV environment where `docker-compose up -d` is used to start containers,
+we need to run these scripts in specific order.
+
+`k8-push-images.sh`
+
+- This script contains only one for loop that goes through each of the builded Docker images.
+- Each Docker image is first [tagged](https://docs.docker.com/engine/reference/commandline/tag/) as `localhost:32000/$image:latest`
+and then [pushed](https://docs.docker.com/engine/reference/commandline/push/) to a `localhost:32000` registry.
+- This script needs to be run every time a Docker image is rebuilt and can be started as:
+```
+./k8-push-images.sh
+```
+
+`k8s-full-delete.sh`
+
+- This script is used for full delete and stop of everything which is currently running inside Kubernetes.
+- This script needs to be run every time we want to re-deploy changes and can be started as:
+```
+./k8s-full-delete.sh
+```
+
+`k8-deploy.sh`
+
+- Kubernetes pods are started/deployed after running this script.
+- This script needs to be run right after we deleted everything using `k8s-full-delete.sh` script and can be started as:
+```
+./k8-deploy.sh
+```

kubescripts/k8s-deploy.sh

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+#!/bin/sh
+
+microk8s helm3 install -f /home/yang/deployment/k8s/values.yaml /home/yang/deployment/k8s --generate-name
+watch microk8s kubectl get pods

kubescripts/k8s-full-delete.sh

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+#!/bin/sh
+
+microk8s kubectl delete --all services
+microk8s kubectl delete --all deployments
+microk8s kubectl delete --all pods
+microk8s kubectl delete --all jobs
+microk8s kubectl delete --all networkpolicy
+microk8s kubectl delete --all pvc
+microk8s kubectl delete --all secret
+microk8s kubectl delete --all ingress
+
+microk8s kubectl delete pv run-pv
+microk8s kubectl delete pv admin-webroot-pv
+microk8s kubectl delete pv main-webroot-pv
+microk8s kubectl delete pv nginx-conf-pv
+microk8s kubectl delete pv downloadables-pv
+microk8s kubectl delete pv docs-pv
+microk8s kubectl delete pv confd-cache-pv
+
+microk8s kubectl delete storageclass local-storage
+

kubescripts/k8s-push-images.sh

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+#!/bin/sh
+
+for image in yc_redis yc_module-compilation yc_admin-ui yc_frontend yangvalidator yc_yangre yc_yangcatalog-ui catalog_backend_api yc_confd yc_documentation; do
+  echo $image
+  docker tag $image:latest localhost:32000/$image:latest
+  docker push localhost:32000/$image:latest
+done