C# Too out of date

[kelsosharp]

In your c# tutorials you are instructing readers to use opentracing.tutorial.library that no longer exists, and there are many steps missing, and the explanation is not detailed enough to be able to infer what needs to be done to do what is needed. ie should any code be replaced, or should new code just be added, and where it should be added.

[yurishkuro]

cc @saschaholesch

[kelsosharp]

Let me update this a bit more clearly, Its not clear in the readme for the lessons that a separate project is getting created and added to the solutions, and since you named it OpenTracing.Tutorials.Library, it looks like it should be part of the nuget package.