[WINDOWS] Add remaining post install steps to unattended setup

* Add USBDK download and install
* Add SPICE-WebDavd download and install
* Update README to remove post install instructions

Signed-off-by: Dani Llewellyn <diddledani@ubuntu.com>

README.md

@@ -244,11 +244,7 @@ quickemu --vm windows-11.conf
 ```
 
   * Complete the installation as you normally would.
-  * Post-install:
-    * Download and install [spice-webdavd](https://www.spice-space.org/download/windows/spice-webdavd/spice-webdavd-x64-latest.msi)
-      * Enables file sharing between the host and guest.
-    * Download and install [UsbDk](https://www.spice-space.org/download/windows/usbdk/)
-      * Enables USB SPICE pass-through between the host and guest.
+  * All relevant drivers and services should be installed automatically.
 
 ### Regional versions
 

quickget

@@ -257,9 +257,29 @@ function unattended_windows() {
       <FirstLogonCommands>
         <SynchronousCommand wcm:action="add">
           <CommandLine>msiexec /i E:\guest-agent\qemu-ga-x86_64.msi /quiet /passive /qn</CommandLine>
-          <Description></Description>
+          <Description>Install Virtio Guest Agent</Description>
           <Order>1</Order>
         </SynchronousCommand>
+        <SynchronousCommand wcm:action="add">
+          <CommandLine>curl.exe -L -o C:\Windows\TEMP\spice-webdavd-x64.msi https://www.spice-space.org/download/windows/spice-webdavd/spice-webdavd-x64-latest.msi</CommandLine>
+          <Description>Download spice-webdavd file sharing agent</Description>
+          <Order>2</Order>
+        </SynchronousCommand>
+        <SynchronousCommand wcm:action="add">
+          <CommandLine>msiexec /i C:\Windows\TEMP\spice-webdavd-x64.msi /quiet /passive /qn</CommandLine>
+          <Description>Install spice-webdavd file sharing agent</Description>
+          <Order>3</Order>
+        </SynchronousCommand>
+        <SynchronousCommand wcm:action="add">
+          <CommandLine>curl.exe -L -o C:\Windows\TEMP\usbdk-x64.msi https://www.spice-space.org/download/windows/usbdk/UsbDk_1.0.22_x64.msi</CommandLine>
+          <Description>Download usbdk USB sharing agent</Description>
+          <Order>4</Order>
+        </SynchronousCommand>
+        <SynchronousCommand wcm:action="add">
+          <CommandLine>msiexec /i C:\Windows\TEMP\usbdk-x64.msi /quiet /passive /qn</CommandLine>
+          <Description>Install usbdk USB sharing agent</Description>
+          <Order>5</Order>
+        </SynchronousCommand>
       </FirstLogonCommands>
     </component>
   </settings>