Add explanation on dependent projects (by Nuget or in the solution)

[Onzi12]

The pull request adds an explanation on:

1. Where one should add the StrongNamer package, especially in a multi-project Solution.
2. How one can successfully release his package with "new" tools (dotnet pack or MSBuild option -t:pack)

I have both of these scenarios, and solving the problem was not trivial, primarily due to the nature of the failures to be raised only at specific scenarios at runtime (when the unsigned code runs for the first time)

[Onzi12]

The pipeline failure is not related to my change.
I only changed the README.md file and the failure is on the Build process.