xFailOverCluster: Update examples to be ready to be published

[johlju]

Pull Request (PR) description

Added

• xFailOverCluster
  • Add the module MarkdownLinkCheck to dependent modules to active the markdown link tests.
  • Added the filetypes to the file .gitattributes according to the Plaster template.
  • Update examples to be ready to be published to the PowerShell Gallery.
  • Added a CONTRIBUTING.md.

Changed

• Changed Visual Studio Code settings to the file settings.json according to the Plaster template.
• Set testRunTitle for PublishTestResults task so that a helpful name is displayed in Azure DevOps for each test run.

This Pull Request (PR) fixes the following issues

None

Task list

• [x] Added an entry to the change log under the Unreleased section of the file CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (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.
• [x] Examples appropriately added/updated.
• [ ] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [x] New/changed code adheres to DSC Community Style Guidelines.

---

This change is