Generate NuGet package

[mowcixo]

It fills the assembly information for generating a .nupkg in the bin directory on each build.

I think it will be a good step to make, to include this original repo of Prestasharp under the NuGet repository, so if you accept the pull request, the next actions to do would be:

• Create a 1.0.0 tag.
• Upload the .nupkg to NuGet public repository: https://docs.microsoft.com/es-es/nuget/create-packages/publish-a-package

If you agree with that and you think I could help, please let me know.