#22 add preference window

[reply2future]

close #22

[codecov]

Codecov Report

Merging #38 (e1630a9) into main (ca005a4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #38   +/-   ##
=======================================
  Coverage   97.18%   97.18%           
=======================================
  Files           1        1           
  Lines          71       71           
=======================================
  Hits           69       69           
  Misses          2        2           

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