add kubelet-serving-cert-approver chart

charts/kubelet-serving-cert-approver/README.md

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+## Introduction
+
+[Kubelet Serving Certificate Approver](https://github.com/alex1989hu/kubelet-serving-cert-approver)
+
+Kubelet Serving Certificate Approver is a custom approving controller which approves kubernetes.io/kubelet-serving Certificate Signing Request that kubelet use to serve TLS endpoints.
+
+This chart bootstraps a [Kubelet Serving Certificate Approver](https://github.com/alex1989hu/kubelet-serving-cert-approver) deployment on a [Kubernetes](https://kubernetes.io) cluster using the [Helm](https://helm.sh) package manager.
+
+## Prerequisites
+
+- Kubernetes
+- Helm
+
+## Parameters
+
+See the [values files](values.yaml).