Add README

Author: bbenne10

README.md

@@ -0,0 +1,26 @@
+# Nix configuration for a bunch of machines
+
+## Deploying
+
+First: Clone the repo
+
+### Darwin
+
+``` console
+$ cd <repo clone root>
+$ nix build ~/.config/darwin\#darwinConfigurations.cipher-4590
+$ ./result/sw/bin/darwin-rebuild switch --flake .
+```
+
+After completing the above, 
+`darwin-rebuild` will be in `$PATH`,
+so a simple `darwin-rebuild switch --flake <path>` will work fine.o
+
+### NixOS
+
+```console
+$ nixos-rebuild switch --flake <repo clone root>
+```
+
+will work
+(if your hostname happens to be `bennett-{server,laptop}`).