add mysql cluster

charts/mysql-cluster/README.md

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+## Introduction
+
+[MySQL Operator](https://dev.mysql.com/doc/mysql-operator/en/)
+
+MySQL Operator for Kubernetes manages MySQL InnoDB Cluster setups inside a Kubernetes Cluster. MySQL Operator for Kubernetes manages the full lifecycle with setup and maintenance including automating upgrades and backups.
+
+This chart bootstraps a [MySQL InnoDB](https://dev.mysql.com/doc/mysql-operator/en/mysql-operator-innodbcluster.html) cluster on a [Kubernetes](https://kubernetes.io) cluster using the [Helm](https://helm.sh) package manager.
+
+## Prerequisites
+
+- Kubernetes
+- Helm
+- MySQL Operator
+
+## Parameters
+
+See the [values files](values.yaml).