Verify contents and format of track documentation

[kytrinyx]

Each language track has documentation in the docs/ directory, which gets included on the site
on each track-specific set of pages under /languages.

We've added some general guidelines about how we'd like the track to be documented in exercism/exercism#3315
which can be found at https://github.com/exercism/exercism.io/blob/master/docs/writing-track-documentation.md

Please take a moment to look through the documentation about documentation, and make sure that
the track is following these guidelines. Pay particularly close attention to how to use images
in the markdown files.

Lastly, if you find that the guidelines are confusing or missing important details, then a pull request
would be greatly appreciated.

[ErikSchierboom]

I've created a short checklist of things to check:

• INSTALLATION.md - how to install the language and any dependencies
• TESTS.md - how to run the tests
• ABOUT.md - short, enticing introduction to the language
• LEARNING.md - where to get an introduction to the language if you're learning it for the first time
• RESOURCES.md - references, tools, etc.
• Put images in docs/img

[ErikSchierboom]

@kytrinyx Updating the TESTS.md and INSTALLATION.md is something I'd like to keep open for a while, as we expect to do a rather massive overhoal once F# runs on the updated .NET Core 2.0. That will be sometime in the first quarter of 2017 probably.

[robkeim]

@ErikSchierboom I think you mean C# :)

[ErikSchierboom]

Ehm, yes. That's what you get when you copy-paste text...