add parameter documentation for #1022

[h44z]

Describe the PR
Update the README, add a short description for the new swag cli parameter

Relation issue
#1022

[codecov]

Codecov Report

Merging #1023 (c4f688a) into master (18b2bd1) will not change coverage.
The diff coverage is n/a.

❗ Current head c4f688a differs from pull request most recent head 79a7672. Consider uploading reports for the commit 79a7672 to get more accurate results

@@           Coverage Diff           @@
##           master    #1023   +/-   ##
=======================================
  Coverage   93.34%   93.34%           
=======================================
  Files           7        7           
  Lines        1968     1968           
=======================================
  Hits         1837     1837           
  Misses         73       73           
  Partials       58       58           

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[ubogdan]

LGTM

[ubogdan]

@h44z Thanks for your contribution.