Adds TeamCity CodeBetter build badge

[avanderhoorn]

This PR adds TeamCity CodeBetter build badge. For those who aren't familiar:

TeamCity is the primary build server for the Microsoft development platform including .NET. CodeBetter hosts TeamCity for the majority of OSS projects in the Microsoft development platform including .NET.

I've followed the conventions used by the other badges/shields and used npm's as a base for this one.

If there is anything you need changed or added let me know.

[espadrine]

It might not be a bother, but the URL looks like it might have DSL syntax. Is there a case where buildType should be escaped?

[avanderhoorn]

I think its ok, but you can see what they have here. I think that the only option within the id section. But if we want to be safe, it can easily escaped.

[avanderhoorn]

Actually that said, you can see there are a few other options here.

[espadrine]

Ah, ok, it is indeed pretty safe. Is the build ID unique to every single build, or is it the same for all builds in the same project?

[avanderhoorn]

Here is what the textbook says:

id: - use internal build id when you need to refer to a specific build

Its unique per build profile. A given project can have multiple build profiles (i.e. CI, nightly, etc).

[espadrine]

I'm rather fine with this. Merged. Thanks a lot!

[avanderhoorn]

Not a problem.