doc(): add EOL disclaimer

README.md

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-[![Build Status](https://travis-ci.org/ncarlier/nunux-reader.svg)](https://travis-ci.org/ncarlier/nunux-reader)
-[![Deploy](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy?template=https://github.com/ncarlier/nunux-reader)
-
 # NUNUX Reader
 
 The super-fast-minimalist-nosql-opensource Google Reader revival.
 
+---
+
+### :warning::warning::warning:This project is no longer maintained:warning::warning::warning:
+
+**Please consider to use another news reader such as [readflow](https://readflow.app)!**
+
+---
+
 ![Screenshot](screenshot.png)
 
 Features: