Update README.md

Author: blackandred

README.md

@@ -1,6 +1,8 @@
 Backup Maker
 ============
 
+> NOTICE: Sadly, we no longer have power to maintain Backup Repository ecosystem as it grew up pretty big and we are not a full-time employeed development team. Feel free to maintain a fork.
+
 [![Test](https://github.com/riotkit-org/br-backup-maker/actions/workflows/test.yaml/badge.svg?branch=main)](https://github.com/riotkit-org/br-backup-maker/actions/workflows/test.yaml)
 
 Tiny backup client packed in a single binary. Interacts with a `Backup Repository` server to store files, uses GPG to secure your