`RDLicenseConfiguration`: No way to licence RDS

Description

This DSC resource doesn't contain a method to license RDS, which is a key bit missing from this collection of DSC resources as well as the Certificate assignment mentioned in #63.

Looking into a method to do this for my own environment in PowerShell, I used a mixture for the RDS:LicenseServer location and using the WMI/CIM class Win32_TSLicenseKeyPack to apply the license and activate.

Here is an example of activating using the method InstallAgreementLicenseKeyPack for this particular type of license.

Set-Location RDS:LicenseServer -ErrorAction Stop

Set-Item .\Configuration\FirstName -Value "Test" -ErrorAction Stop
Set-Item .\Configuration\LastName -Value "Test" -ErrorAction Stop
Set-Item .\Configuration\Company -Value "Test" -ErrorAction Stop
Set-Item .\Configuration\CountryRegion -Value "Test" -ErrorAction Stop
Set-Item .\ActivationStatus -Value 1 -ConnectionMethod AUTO -Reason 5 -ErrorAction Stop

Applies License

$Argumentlist =@(
4, # AgreementType
9999, # LicenseCount
1, # ProductType
5, # ProductVersion
$agreementnumber # AgreementNumber
)

$InstallLicenseKey = Invoke-WmiMethod -Namespace "root/cimv2" -Class Win32_TSLicenseKeyPack -Name InstallAgreementLicenseKeyPack -ArgumentList $Argumentlist

Adds the license server to the Terminal Server License Servers group on the domain controller (Run as Enterprise Admin)

Set-Item -Path RDS:\LicenseServer\LSinTSLSGroup -Value 1 -ErrorAction Stop

Proposed properties

I'm not really sure this can vary wildly depending on the type of License you trying to apply.

Special considerations or limitations

No repository files or tests are named. Start by reviewing the existing RDLicenseConfiguration resource and the RDS:LicenseServer location, then compare its needs with Win32_TSLicenseKeyPack and InstallAgreementLicenseKeyPack. Done requires a defined set of resource properties and a confirmed approach for applying and activating the license.