Add repository health / community standards docs

[andypiper]

Currently does not include:

• LICENSE
• CONTRIBUTING
• CODE OF CONDUCT

Could also add PR template to make it easier to signoff on contributions.

[danielknell]

can copy over https://github.com/artisanofcode/.github/blob/main/CODE_OF_CONDUCT.md and it can go through the form I have setup already for my other projects.

[andypiper]

Sounds good, I was going to suggest Contributor Cov as a probable CoC of choice.

[andypiper]

Is CC0 an appropriate license? Should we poll the contributors to the repo on how this should be licensed, somehow?

[danielknell]

its CC BY 3.0 in the footer.