Update README.md

Author: zadam

README.md

@@ -1,8 +1,12 @@
 # Trilium Notes
 
+## Trilium is in maintenance mode - see details in https://github.com/zadam/trilium/issues/4620
+
 [![Join the chat at https://gitter.im/trilium-notes/Lobby](https://badges.gitter.im/trilium-notes/Lobby.svg)](https://gitter.im/trilium-notes/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [English](https://github.com/zadam/trilium/blob/master/README.md) | [Chinese](https://github.com/zadam/trilium/blob/master/README-ZH_CN.md) | [Russian](https://github.com/zadam/trilium/blob/master/README.ru.md) | [Japanese](https://github.com/zadam/trilium/blob/master/README.ja.md)
 
-Trilium Notes is a hierarchical note taking application with focus on building large personal knowledge bases. See [screenshots](https://github.com/zadam/trilium/wiki/Screenshot-tour) for quick overview:
+Trilium Notes is a hierarchical note taking application with focus on building large personal knowledge bases. 
+
+See [screenshots](https://github.com/zadam/trilium/wiki/Screenshot-tour) for quick overview:
 
 <a href="https://github.com/zadam/trilium/wiki/Screenshot-tour"><img src="https://raw.githubusercontent.com/wiki/zadam/trilium/images/screenshot.png" alt="Trilium Screenshot" width="1000"></a>