Added the rest of the configuration. Still some things to add.

modules/misc/users.nix

@@ -0,0 +1,16 @@
+{ config, ... }:
+
+{
+  users.users.numbus-admin = {
+    shell = pkgs.fish;
+    isNormalUser = true;
+    description = "Numbus Admin";
+    extraGroups = [ "wheel" ];
+    uid = 1000;
+    initialPassword = "changeMe!";
+    # required for auto start before user login
+    linger = true;
+    # required for rootless container with multiple users
+    autoSubUidGidRange = true;
+  };
+}