Add windows vagrantfile

Author: tom300z

README.md

@@ -45,3 +45,11 @@ Requires Xcode Command Line Tools
 ```bash
 bash ./scripts/build-macos.sh
 ```
+
+### Vagrant VMs (optional)
+For quick cross-OS testing in VMs using VirtualBox:
+
+- Ubuntu Desktop: `cd vagrant/ubuntu; vagrant up`
+- Windows 11: `cd vagrant/windows; vagrant up`
+
+Both VMs sync the repo into the guest (`/mnt/derpiwallpaper` on Ubuntu, `C:\derpiwallpaper` on Windows).

vagrant/windows/Vagrantfile

@@ -0,0 +1,37 @@
+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+# Windows development VM for DerpiWallpaper
+Vagrant.configure("2") do |config|
+  # Use a prebuilt Windows 11 box (VirtualBox provider supported)
+  # Other options include: gusztavvargadr/windows-10 or windows-2022 for Server
+  config.vm.box = "gusztavvargadr/windows-11"
+
+  # Explicitly mark guest type and communicator
+  config.vm.guest = :windows
+  config.vm.communicator = "winrm"
+
+  # Increase boot timeout; Windows boots can take longer
+  config.vm.boot_timeout = 900
+
+  # Sync the repository into the guest
+  # On Windows guests, using VirtualBox shared folders avoids SMB credential prompts
+  config.vm.synced_folder "../../", "C:/derpiwallpaper", type: "virtualbox"
+
+  # Optional: forward RDP for convenience (GUI is usually shown by provider as well)
+  # config.vm.network "forwarded_port", guest: 3389, host: 53389, auto_correct: true
+  config.vm.network "forwarded_port", guest: 22, host: 2224, id: "ssh", auto_correct: true
+
+  # VirtualBox provider tweaks
+  config.vm.provider "virtualbox" do |vb|
+    vb.gui = true
+    vb.memory = "4096"
+    vb.cpus = 2
+  end
+
+  # Example PowerShell provisioning (disabled by default)
+  # config.vm.provision "shell", inline: <<-POWERSHELL
+  #   Write-Output "Windows VM ready for DerpiWallpaper"
+  # POWERSHELL
+end
+