add the readme

README.md

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+This is intended for use with the [elk-jdbc-sso](https://git.96-fromsofia.net/k8s/elk-jdbc-sso) stack.
+More information about how this project can be found there.
+
+- To run the playbook:
+```
+ansible-playbook -i inventory/hosts.yml playbooks/deploy.yml --ask-become-pass
+```
+
+- It is also possible to run individual phases:
+```
+# Regenerate certificates only
+ansible-playbook -i inventory/hosts.yml playbooks/deploy.yml --tags certs,secrets
+
+# Redeploy only Logstash
+ansible-playbook -i inventory/hosts.yml playbooks/deploy.yml --tags logstash
+
+# Redeploy Elasticsearch and re-run setup
+ansible-playbook -i inventory/hosts.yml playbooks/deploy.yml --tags elasticsearch,es-setup
+```
+
+- To remove the deployment:
+```
+# Remove all K8s resources but keep Minikube running
+ansible-playbook -i inventory/hosts.yml playbooks/teardown.yml --ask-become-pass
+
+# Remove everything including Minikube
+ansible-playbook -i inventory/hosts.yml playbooks/teardown.yml --ask-become-pass -e stop_minikube=true
+```