CONTRIBUTING page

[anton-seaice]

Shall we add https://github.com/ACCESS-NRI/model-deployment-template/blob/main/CONTRIBUTING.md to this repo?

Its referenced in the readme, but doesn't exist

[anton-seaice]

ping @CodeGat

[CodeGat]

Yes please. This repo must have been generated from the template before the CONTRIBUTING.md was a thing!