Add citation.cff and core team guide in order to get a DOI

[maxrjones]

@TomNicholas @norlandrhagen should the authors in citations.cff be based on https://github.com/orgs/zarr-developers/teams/virtualizarr-core-devs, git shortlog -sne, or some combination?

p.s. if you write a JOSS article it could be added as the preferred citation similar to Xarray's Journal of Open Research Software article

Closes #305

[TomNicholas]

This is great @maxrjones ! (I mean I did write this guide orginally haha)

[TomNicholas]

authors in citations.cff

I think it kind of needs to be a manually-chosen list. I added somewhat random (trusted) people to that list the core-devs github team to reduce the bus factor initially. And there are people I think deserve to get the citations who haven't actually contributed code to this library directly and aren't on that core-devs list (I'm thinking mainly of @martindurant).

[maxrjones]

authors in citations.cff

I think it kind of needs to be a manually-chosen list. I added somewhat random (trusted) people to that list the core-devs github team to reduce the bus factor initially. And there are people I think deserve to get the citations who haven't actually contributed code to this library directly and aren't on that core-devs list (I'm thinking mainly of @martindurant).

Sounds good, sorry to put this on you but I think you and @norlandrhagen should come up with this initial list as the most consistent VirtualiZarr developers so far (as shown by https://github.com/zarr-developers/VirtualiZarr/graphs/contributors).

[TomNicholas]

Sounds good, sorry to put this on you but I think you and @norlandrhagen should come up with this initial list

No worries - I literally already have a written ToDo somewhere where I started doing this.