added a new metadata field for multi-model/family app

[keighrim]

addresses #251

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.04%. Comparing base (7c79f1d) to head (bafdb1c).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #272      +/-   ##
===========================================
+ Coverage    60.99%   61.04%   +0.04%     
===========================================
  Files            6        6              
  Lines          805      806       +1     
===========================================
+ Hits           491      492       +1     
  Misses         314      314              

Flag	Coverage Δ
unittests	61.04% <100.00%> (+0.04%)	⬆️

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