Add whoami endpoint

[SilviaAmAm]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.44%. Comparing base (9228539) to head (85a738a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   65.65%   66.44%   +0.79%     
==========================================
  Files          49       51       +2     
  Lines         722      739      +17     
  Branches       57       57              
==========================================
+ Hits          474      491      +17     
  Misses        232      232              
  Partials       16       16              

Flag	Coverage Δ
backend	69.02% <100.00%> (+0.79%)	⬆️
jest	37.70% <ø> (ø)

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