Update to use template files

[johlju]

Pull Request (PR) description

• Update appveyor.yml to use the default template.
• Added default template files .codecov.yml, .gitattributes, and .gitignore, and
  .vscode folder.
• The module manifest now contain the correct PowerShell version.

This Pull Request (PR) fixes the following issues

Task list

• Added an entry under the Unreleased section of the change log in the README.md.
  Entry should say what was changed, and how that affects users (if applicable).
• Resource documentation added/updated in README.md.
• Resource parameter descriptions added/updated in README.md, schema.mof
  and comment-based help.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Resource Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[johlju]

Reviewed 8 of 8 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (dev@f6445fb). Click here to learn what that means.
The diff coverage is n/a.

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  Files          ?     1           
  Lines          ?     8           
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  Hits           ?     0           
  Misses         ?     8           
  Partials       ?     0

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