Readme warning - Depraction notice (#292)

* warning README

README.md

@@ -1,4 +1,10 @@
-# CRI-Resource-Manager extension for Gardener*
+# Deprecation notice warning!
+
+| **Warning** |
+| ---------------- |
+| **This project is no longer maintained!** Current versions (master and v1.1.0) of this extension was based on https://github.com/intel/cri-resource-manager/ which is superseded by https://github.com/containers/nri-plugins/. Support for `nri-plugins` project is available in this work-in-progress **on-hold** PR [here](https://github.com/intel/gardener-extension-cri-resmgr/pull/267). If you have an ongoing need to use this project, are interested in independently developing it, or would like to maintain patches for the open source software community, please contact pawel.palucki@intel.com |
+
+## CRI-Resource-Manager extension for Gardener*
 
 [![Go build and test](https://github.com/intel/gardener-extension-cri-resmgr/actions/workflows/go.yml/badge.svg?branch=master)](https://github.com/intel/gardener-extension-cri-resmgr/actions/workflows/go.yml)