「アグノストス」を追加

[ysakasin]

公式サイト：https://agnostos-official.jimdofree.com/

[codecov]

Codecov Report

Attention: Patch coverage is 99.13043% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.81%. Comparing base (de00faa) to head (d9b7fd1).
Report is 45 commits behind head on master.

Files	Patch %	Lines
lib/bcdice/game_system/Agnostos.rb	99.12%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #723      +/-   ##
==========================================
+ Coverage   95.76%   95.81%   +0.04%     
==========================================
  Files         355      361       +6     
  Lines       20754    21356     +602     
  Branches     5444     5652     +208     
==========================================
+ Hits        19876    20462     +586     
- Misses        878      894      +16     

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