Enable CodeCov Support

[TraGicCode]

Hey @johlju ,

What is the process i need to follow in order to enable codecov for this?

[johlju]

1. PR Unit Tests not running because of naming convention. #16 should be merged so tests are properly tested.
2. Add CodeCoverage and CodeCov parameters to the Invoke-AppveyorTestScriptTask helper function in appveyor.yml from the appveyor.yml template. Note: It looks to me like you should be able to replace the entire appveyor.yml to the one in the template.
3. Copy the .codecov.yml from for example SqlServerDsc (added an issue to add it to the DscResource template folder).
4. Codecov should be enabled. I think this is already done on all repos. If the Codecov bot is adding a comment to the PR after the tests has run, then it works. If it does not, Codecov must be enable by PowerShell DSC team.

I think that's it. 🤔