docs: unmaintained

README.md

@@ -1,5 +1,7 @@
 # Refined Pipes [![Build Status](https://github.com/refinedmods/refinedpipes/actions/workflows/build.yml/badge.svg?branch=develop)](https://github.com/refinedmods/refinedpipes/actions/workflows/build.yml) [![CurseForge](http://cf.way2muchnoise.eu/full_370696_downloads.svg)](https://www.curseforge.com/minecraft/mc-mods/refined-pipes) [![Discord](https://img.shields.io/discord/342942776494653441)](https://discordapp.com/invite/VYzsydb) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](LICENSE.md)
 
+> NOTE: Due to a lack of time, Refined Pipes will no longer be receiving further updates or maintenance. This situation may change in the future.
+
 Refined Pipes is a Minecraft mod that adds item, fluid and energy pipes.
 
 The goal is to have the best standalone item, fluid and energy pipes.