Updating tutorials for C# Dev KIt

[webreidi]

Summary

I've updated a set of the dotnet tutorials for VS Code to incorporate the usage of C# Dev Kit. I'll be doing a set of these periodically as I get time.

Fixes #Issue_Number (if available)

---

Internal previews

📄 File	🔗 Preview link
docs/core/tutorials/debugging-with-visual-studio-code.md	Tutorial: Debug a .NET console application using Visual Studio Code
docs/core/tutorials/library-with-visual-studio-code.md	Create a .NET class library using Visual Studio Code
docs/core/tutorials/testing-library-with-visual-studio-code.md	Tutorial: Test a .NET class library using Visual Studio Code
docs/core/tutorials/with-visual-studio-code.md	docs/core/tutorials/with-visual-studio-code

[tdykstra]

@webreidi If your time for working on this is limited at the moment, let me know if you'd like me to address the remaining feedback myself in a PR to your PR branch. I expect to have some time I could spend on it next week.

[webreidi]

@webreidi If your time for working on this is limited at the moment, let me know if you'd like me to address the remaining feedback myself in a PR to your PR branch. I expect to have some time I could spend on it next week.

Yeah, I get very limited time to work on things as I'm pulled in a million directions. If you have time to finish this one up, I would greatly appreciate it.

[gewarren]

@tdykstra Is this ready to go?

[tdykstra]

@tdykstra Is this ready to go?

No it's not, as I've been focusing on other things. If I don't get to it this week I'll finish it this weekend.

[tdykstra]

@webreidi I added a commit that addresses the remaining issues. Please review and if it looks good we can merge this.