Add best practice guidelines

Add a document outlining requirements for Ansible roles. For example:

• Have a README
• Have a usage example
• Assert all required variables are set
• Be idempotent
• Be compose-able
• Be orthogonal

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changed title from Add best pracice guidelines to Add best practice guidelines

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mentioned in merge request !19 (merged)

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Closed by !19 (merged)

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assigned to @si202