Update AddRelationshipCommand to include checks for number of bioParents relationships (cannot be more than 2)

[Tsenrae]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 82.75862% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 73.93%. Comparing base (83a241e) to head (0d3fb6a).
Report is 6 commits behind head on master.

Files	Patch %	Lines
...ess/logic/relationship/AddRelationshipCommand.java	82.75%	0 Missing and 5 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #177      +/-   ##
============================================
+ Coverage     72.82%   73.93%   +1.11%     
- Complexity      802      818      +16     
============================================
  Files           110      108       -2     
  Lines          2653     2655       +2     
  Branches        345      359      +14     
============================================
+ Hits           1932     1963      +31     
+ Misses          633      599      -34     
- Partials         88       93       +5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Emberlynn-Loo]

LGTM