Add .zenodo.json

[thangleiter]

Grant info is required on repositories that are included in EU-funded zenodo communities, and it doesn't look like the CITATION.cff file supports it. Without this metadata, the automatic pull on new releases does not work.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.46%. Comparing base (69528f8) to head (cfc1838).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #115   +/-   ##
=======================================
  Coverage   97.46%   97.46%           
=======================================
  Files           9        9           
  Lines        2407     2407           
  Branches      450      450           
=======================================
  Hits         2346     2346           
  Misses         33       33           
  Partials       28       28           

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