Merge pull request #1576 from NixOS/deprecation-warning

Add a disclaimer to the README

Author: roberth

README.md

@@ -1,5 +1,11 @@
 # NixOps
 
+> [!Warning]
+> NixOps is in low-maintenance mode and probably not suited for new projects. Use at your own risks.
+
+> [!Note]
+> An experimental rewrite of NixOps is happening under https://github.com/nixops4/nixops4
+
 [![Test](https://github.com/NixOS/nixops/workflows/CI/badge.svg)](https://github.com/NixOS/nixops/actions)
 
 _NixOps_ is a tool for deploying to [NixOS](https://nixos.org) machines in a network or the cloud. Key features include: