add README

README.md

@@ -0,0 +1,61 @@
+# Hundred Rabbits on Nix
+
+**TODO** Submit PR to nixpkgs
+
+## Example usage with `configuration.nix`
+
+Clone the repo:
+
+```sh
+git clone https://github.com/egasimus/rabbits /etc/nixos/rabbits
+```
+
+Import into `configuration.nix`:
+
+```nix
+{ pkgs, ... }: let
+  # ...
+  rabbits = (pkgs.callPackage (import ./rabbits/default.nix) {});
+  # ...
+in {
+  environment.systemPackages = [
+    # ...
+    rabbits.orca
+    rabbits.pilot
+    rabbits.marabu
+    rabbits.left
+    rabbits.ronin
+    rabbits.dotgrid
+    # ...
+  ];
+}
+```
+
+Rebuild:
+
+```sh
+sudo nixos-rebuild switch --fast
+```
+
+Launch:
+
+```sh
+orca-osc
+pilot-osc
+marabu
+left
+ronin
+dotgrid
+```
+
+Update:
+
+```
+cd /etc/nixos/rabbits
+git pull
+sudo nixos-rebuild switch --fast
+```
+
+## Usage with overlays/profiles/flakes/etc.
+
+Left as an exercise to the reader.