Add OpenTapPackage reference from command line
If it was possible to add OpenTapPackageReference and AdditionalOpenTapPackage from the command line, I believe it would be easier to document and get people to use that functionality.
I suggest something like this:
# To add OpenTapPackageReference
tap sdk new package-reference Demonstration --repository packages.opentap.io --version 9.8.5 --csproj TestProject.csproj
# To add AdditionalOpenTapPackage when building as 'Debug'.
tap sdk new package-reference Demonstration --additional --repository packages.opentap.io --version 9.8.5 --csproj TestProject.csproj --Configuration Debug
'--target' could also be used, but I think --csproj is more explicit. It could also be --project.