Add licence type to Nuget Package

[thompson-tomo]

Is your feature request related to a problem? Please describe.

In dependency track this package is reporting as not having a licence type specified

Describe the solution you'd like

The PackageLicenseExpression property is set in the csproj so that the NUGET package has the information. This can then be included in the SBOM so that analysis can occur in the appropriate tools

Describe alternatives you've considered

Ignore them, bundle licence file into package & reference the file.

Additional context

N:a

[brantburnett]

Thanks for pointing this out. I've switched to using an SPDX instead of embedding the text in the NuGet, this is releasing shortly as 1.1.5.