Add more metadata fields

[nuest]

Closes #25

[codecov-commenter]

Codecov Report

Merging #26 (e939bf2) into main (5ee911e) will decrease coverage by 23.39%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main      #26       +/-   ##
===========================================
- Coverage   55.96%   32.57%   -23.39%     
===========================================
  Files           6        6               
  Lines         218      221        +3     
  Branches       38       38               
===========================================
- Hits          122       72       -50     
- Misses         89      149       +60     
+ Partials        7        0        -7     

Files Changed	Coverage Δ
src/zenodo_client/struct.py	72.00% <100.00%> (-0.35%)	:arrow_down:

... and 1 file with indirect coverage changes

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more

[cthoyt]

@nuest please see the testing logs, this gives several pieces of feedback on what needs to be fixed with respect to linting (just run tox -e lint to fix these errors) as well as issues with the testing metadata

[cthoyt]

I finished this, thank you @nuest !