Add krops multi-machine deployment configuration for nix-25.05

Sets up deployment infrastructure for two NixOS machines using krops,
with individual and combined deployment targets.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

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+# Krops Multi-Machine Deployment
+
+This project deploys NixOS configurations to two machines using krops with nix-25.05.
+
+## Structure
+
+```
+.
+├── krops.nix                      # Main deployment configuration
+└── config/
+    ├── machine1/
+    │   └── configuration.nix      # Machine 1 NixOS config
+    └── machine2/
+        └── configuration.nix      # Machine 2 NixOS config
+```
+
+## Setup
+
+1. Update target hostnames/IPs in `krops.nix`:
+   - Change `root@machine1.example.com` to your machine1 address
+   - Change `root@machine2.example.com` to your machine2 address
+
+2. Customize NixOS configurations in `config/machine1/configuration.nix` and `config/machine2/configuration.nix`
+
+## Usage
+
+Deploy to a single machine:
+```bash
+nix-build ./krops.nix -A machine1 && ./result
+nix-build ./krops.nix -A machine2 && ./result
+```
+
+Deploy to all machines:
+```bash
+nix-build ./krops.nix -A all && ./result
+```
+
+## Requirements
+
+- SSH access to target machines as root
+- Target machines running NixOS
+- nix installed on the deployment machine