feat: Add swagger

[thomaspoignant]

Description

Add swagger

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 112 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (9e2a73d) to head (f36de59).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
handler/flags.go	0.00%	67 Missing ⚠️
api/server.go	0.00%	20 Missing ⚠️
dao/postgres_impl.go	0.00%	17 Missing ⚠️
main.go	0.00%	4 Missing ⚠️
docs/docs.go	0.00%	2 Missing ⚠️
model/http_error.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main      #2   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          6       9    +3     
  Lines        461     531   +70     
=====================================
- Misses       461     531   +70     

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