Add nixus deployment tool

README.md

@@ -89,6 +89,7 @@
 * [Nixery](https://github.com/tazjin/nixery) - A Docker-compatible container registry which builds images ad-hoc via Nix.
 * [Nixinate](https://github.com/MatthewCroughan/nixinate) - A Nix flake library to provide app outputs for managing existing NixOS hosts over SSH.
 * [NixOps](https://github.com/NixOS/nixops) - The official Nix deployment tool, compatible with AWS, Hetzner, and more.
+* [nixus](https://github.com/Infinisil/nixus) - Infinisil's experimental deployment tool supporting multi-host abstractions
 * [pushnix](https://github.com/arnarg/pushnix) - Simple cli utility that pushes NixOS configuration and triggers a rebuild using ssh.
 * [terraform-nixos](https://github.com/tweag/terraform-nixos) - A set of Terraform modules designed to deploy NixOS.
 * [terranix](https://terranix.org) - Use Nix and the NixOS module system to write your Terraform code.