Chart deprecation notice

README.md

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 [![CircleCI](https://circleci.com/gh/cetic/helm-postgresql.svg?style=svg)](https://circleci.com/gh/cetic/helm-postgresql/tree/master) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0) ![version](https://img.shields.io/github/tag/cetic/helm-postgresql.svg?label=release)
 ![test](https://github.com/cetic/helm-postgresql/actions/workflows/basic_test.yml/badge.svg)
 
+## $${\color{red}This \space project \space is \space not \space maintained \space anymore.}$$
+
+If you are interested in maintaining a fork of this project, you can advertise it in the [dedicated issue](https://github.com/cetic/helm-postgresql/issues/21).
+
+
 ## Introduction
 
 This [Helm](https://github.com/kubernetes/helm) chart installs [postgreSQL](https://www.postgresql.org/) in a Kubernetes cluster.