add yomitan server

[occamist]

closes #39

[codecov]

Codecov Report

❌ Patch coverage is 82.93839% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.47%. Comparing base (cab6470) to head (dd83103).

Files with missing lines	Patch %	Lines
commands/anki.go	54.05%	32 Missing and 2 partials ⚠️
commands/yomitan.go	96.22%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #41       +/-   ##
===========================================
+ Coverage   47.88%   79.47%   +31.58%     
===========================================
  Files           7       10        +3     
  Lines         472      643      +171     
===========================================
+ Hits          226      511      +285     
+ Misses        219       93      -126     
- Partials       27       39       +12     

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