Add a citation CIFF file to the repo so that zenodo picks up all authors. We need this for the final JOSS paper acceptance openjournals/joss-reviews#6934 (comment).

• all authors and contributors
• add the JOSS paper JOSS paper #328

After adding the CIFF file we need to make another patch level release.

See openjournals/joss-reviews#6934 (comment) for background:

One can tune the metadata in Zenodo using a CIFF file: https://citation-file-format.github.io/. You can see an example for one of my packages here. You would need to make another release after, probably with updated version. There is also contributer role available, so if you want to credit other people who are not in the paper, that could be done.