Model OpenGates like Contributor Covenant

[VickiLanger]

As a...

• project owner

I want to...

• include the OpenGates checklist as part of ourcontributing.md

So that...

• the OpenGates checklist can be used as a standard for the project and all contributors will know the expectations

Imagine something similar to how http://www.contributor-covenant.org/ has provided a standard cut & paste code_of_conduct.md
Idea credit: @andyhaskell

Note: modelling like this will require versioning and releases.

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