add core configuration

home-manager/modules/rofi/default.nix

@@ -0,0 +1,20 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  cfg = config.lily.rofi;
+in {
+  options.lily.rofi = {
+    enable = lib.mkEnableOption "activate rofi";
+  };
+
+  config = lib.mkIf cfg.enable {
+    programs.rofi = {
+      package = pkgs.rofi-wayland;
+      enable = true;
+      plugins = [pkgs.rofi-calc];
+    };
+  };
+}