move mysql operator and cluster

deploy/mysql-operator/templates/NOTES.txt

@@ -0,0 +1,19 @@
+You can create a new cluster by issuing:
+
+cat <<EOF | kubectl apply -f-
+apiVersion: mysql.presslabs.org/v1alpha1
+kind: MysqlCluster
+metadata:
+  name: my-cluster
+spec:
+  replicas: 1
+  secretName: my-cluster-secret
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: my-cluster-secret
+type: Opaque
+data:
+  ROOT_PASSWORD: $(echo -n "not-so-secure" | base64)
+EOF