Add volume and issue

[mc2]

Add getters for volume and issue

[codecov]

Codecov Report

Merging #10 (d35e5b1) into main (27ffa10) will decrease coverage by 0.44%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main      #10      +/-   ##
==========================================
- Coverage   78.73%   78.29%   -0.45%     
==========================================
  Files          19       19              
  Lines        1218     1230      +12     
  Branches       24       24              
==========================================
+ Hits          959      963       +4     
- Misses        258      266       +8     
  Partials        1        1              

Impacted Files	Coverage Δ
src/models/metadata.ts	50.65% <33.33%> (-0.47%)	⬇️

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