add the swagger badge with link to the readme

[shdpl]

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[codeclimate]

Code Climate has analyzed commit e05dafd and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #19 (e05dafd) into main (6794219) will increase coverage by 7.56%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main      #19      +/-   ##
============================================
+ Coverage     73.72%   81.29%   +7.56%     
- Complexity       37       45       +8     
============================================
  Files            12       13       +1     
  Lines           118      139      +21     
============================================
+ Hits             87      113      +26     
+ Misses           31       26       -5     

Impacted Files	Coverage Δ	Complexity Δ
src/Http/Services/FileService.php	93.93% <0.00%> (-1.72%)	13.00% <0.00%> (+4.00%)	⬇️
src/Http/Exceptions/CannotDeleteFile.php	100.00% <0.00%> (ø)	1.00% <0.00%> (?%)
src/Http/Exceptions/Handler.php	75.00% <0.00%> (+12.50%)	4.00% <0.00%> (+1.00%)
src/Http/Controllers/FileApiController.php	85.18% <0.00%> (+15.95%)	6.00% <0.00%> (ø%)
src/Http/Requests/FileDeleteRequest.php	75.00% <0.00%> (+75.00%)	4.00% <0.00%> (+2.00%)

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