Add GOVERNANCE.md as default community health file

[ShaneCurcuru]

There is a lot of work around sustainability these days, and one key need for open source participants and users is understanding how the many FOSS components they use are governed. Adopting this common file name (already in use in some places) as one of the default community health files can help encourage new projects and organizations to think about governance up front, rather than tacking it on later if they get popular.

Some examples of research and practical work in this space: https://fossgovernance.org/
https://ospo.zone/ggi/
https://github.com/github/MVG
https://sustainoss.org/working-groups/governance-guidance/

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

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Source	Preview	Production	What Changed
communities/setting-up-your-project-for-healthy-contributions/creating-a-default-community-health-file.md	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

[steveward]

Thanks for the PR @ShaneCurcuru, I'll get this triaged for review! ✨

[skedwards88]

Thank you for adding this! I made a change to make the example a little more general while still capturing what the governance file might include. I'll get this merged down for you.

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[RichardLitt]

Great job, @ShaneCurcuru!

[abbycabs]

love this! Thanks @ShaneCurcuru & @skedwards88