add install instructions

Readme.md

@@ -7,3 +7,7 @@ This is a Cloud-Init Agent for Windows. It's used to deploy VServer at [Realtoxm
 - Password
 
 As windows needs the password in Cleartext, it cannot be set directly from the Cloud-Init configuration. We implemented a special IP, which compares the hashed password ( which is provided via Cloud-Init ), with the unencrypted password, saved in WHMCS. The Password can be found [here](https://git.itbyhf.xyz/ha/windows-cloudinit-pwapi)
+
+## Installation
+
+There is a script called `install.ps1`. Copy this script to the VM and execute it using powershell. It will download the latest version and register the service. After installing place the `config.json` in the `C:\Cloud-Init` folder. Now the image is prepared and you can reset it to the OOBE mode with the unattend.xml file and the following command: `C:\Windows\system32\sysprep\sysprep.exe /generalize /oobe /shutdown /unattend:"C:\Cloud-Init\unattend.xml"`
\ No newline at end of file

install.ps1

+$cloudinitUrl = "https://s3.jonasled.de/share/cloudinit-windows-amd64.exe"
+$nssmUrl = "https://nssm.cc/release/nssm-2.24.zip"
+$workDir = 'C:\Cloud-Init'
+$cloudInitTargetPath = "$workDir\cloud-init.exe"
+$nssmTargetPath = "$workDir\nssm.zip"
+$nssmPath = "$workDir\nssm-2.24\win64\nssm.exe"
+$serviceName = "Cloud-Init"
+
+
+New-Item -Path "c:\" -Name "Cloud-Init" -ItemType "directory"
+
+Write-Host "Downloading Cloud-Init..."
+$ProgressPreference = 'SilentlyContinue'
+Invoke-WebRequest -Uri $cloudinitUrl -OutFile $cloudInitTargetPath
+
+Write-Host "Downloading NSSM..."
+Invoke-WebRequest -Uri $nssmUrl -OutFile $nssmTargetPath
+
+Expand-Archive -LiteralPath $nssmTargetPath -DestinationPath $workDir
+Remove-Item $nssmTargetPath
+
+Start-Process -FilePath $nssmPath -ArgumentList "install $serviceName $cloudInitTargetPath" -NoNewWindow -Wait
+Start-Process -FilePath $nssmPath -ArgumentList "set $serviceName AppDirectory $workDir" -NoNewWindow -Wait
+Start-Process -FilePath $nssmPath -ArgumentList "set $serviceName Start SERVICE_AUTO_START" -NoNewWindow -Wait
+Start-Process -FilePath $nssmPath -ArgumentList "set $serviceName AppExit Default Ignore" -NoNewWindow -Wait