added vm build

machines/vm/configuration.nix

@@ -0,0 +1,30 @@
+{ config, pkgs, nixos-hardware, home-manager, lib, ... }:
+
+{
+  imports =
+    [
+      home-manager.nixosModules.home-manager
+      ../../user
+      ../../modules/gpu/intel
+      ../../modules/basic
+      ../../modules/audio
+      ../../modules/samba
+      ../../modules/laptop
+      ../../modules/docker
+      ../../modules/flatpak
+      ../../desktop/gnome
+    ];
+
+  networking.hostName = "test-vm"; # Define your hostname.
+  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
+
+  system.stateVersion = "23.05"; # Did you read the comment?
+  users.users.alice.initialPassword = "test";
+  virtualisation.vmVariant = {
+  # following configuration is added only when building VM with build-vm
+    virtualisation = {
+      memorySize =  2048; # Use 2048MiB memory.
+      cores = 3;         
+    };
+  };
+}