Add MSTest tutorial (#915)

[ncarandini]

Summary

An article to show how to use MSTest instead of xUnit to write the test project contained on the Getting started with .NET Core on Windows tutorial.

Fixes #915

Suggested Reviewers

@BillWagner

[dnfclas]

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[dnfclas]

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[svick]

Should it be "MSTest" instead of "MSUnit"?

[ncarandini]

Fixed.

[BillWagner]

@ncarandini Thanks for writing this. It's very much on the right track.

I left some feedback on a few items to update. Then as you finish up, I think it will be ready.

[qinezh]

Open Publishing Build Service: The pull request content has been published and here are some sample preview links:

• Docset 1: core-docs

[ncarandini]

@BillWagner Thanks for reviewing, I've done all required changes. Now two questions:

Where to put it

Looking at the docs structure I see two candidated places:

• .NET Core Guide | Tutorials | Use MSTest with .NET Core on Windows
• .NET Core Guide | Unit Testing | Use MSTest with .NET Core on Windows

Were to put links to it

Because is strictly related to Windows scenario, we can create a link in the Getting started with .NET Core on Windows article, at the end of Writing the test project section.
We can also create a link in the Unit Testing in .NET Core, right at the end.

[BillWagner]

@ncarandini Thanks for all the work on this.

Let's put it here:

.NET Core Guide | Unit Testing | Use MSTest with .NET Core on Windows

I agree with both your suggestions on links:

We can create a link in the Getting started with .NET Core on Windows article, at the end of Writing the test project section.
We can also create a link in the Unit Testing in .NET Core, right at the end.

You should also update docs/toc.md to provide an entry under .NET Core Guide | Unit Testing.

Then, it will show up in the left nav.

Once those links are added, I'll give it one last review and merge it.
Thanks again!

[qinezh]

Open Publishing Build Service: The pull request content has been published and here are some sample preview links:

• Docset 1: core-docs

[BillWagner]

@ncarandini Thanks for that last update. This is great content.

🎆

[ncarandini]

@BillWagner Thanks, this has been a great experience for me!