Document the "star" behavior in Nuget

[blackdwarf]

The "star" in NuGet means essentially a wildcard: bring the highest number of the part of the version where the star is.

We should document how this works as well as why it is not a recommended practice, especially w.r.t the platform metapackage(s). For more information on why this is a problem, please refer to dotnet/cli#2454.

/cc @mairaw @richlander @cartermp

[cartermp]

I mention it here: https://docs.microsoft.com/en-us/dotnet/articles/core/tutorials/managing-package-dependency-versions

But it probably should be more prominent and in another article.

[mairaw]

@cartermp who would know how this is behaving now? @livarcocc can you help?

[cartermp]

I'm pretty sure it behaves the same as it did in the project.json days, modulo some bug fixes since then.

[IEvangelist]

No longer relevant