AzureDevOpsDsc: Adds GitHub templates

[johlju]

Pull Request (PR) description

• AzureDevOpsDsc
  • Added GitHub issue templates and pull request template (issue #1)

This Pull Request (PR) fixes the following issues

• Fixes #1

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 updated in the resource's README.md.
• [ ] Resource parameter descriptions updated in schema.mof.
• [ ] Comment-based help updated, including parameter descriptions.
• [ ] Localization strings updated.
• [ ] Examples updated.
• [ ] Unit tests updated. See DSC Community Testing Guidelines.
• [ ] Integration tests updated (where possible). See DSC Community Testing Guidelines.
• [ ] Code changes adheres to DSC Community Style Guidelines.

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This change is 

[johlju]

@kilasuit the tests will always fail until we get the first resource PR:ed in.