Add `extras` rails projection

vimrc

@@ -321,7 +321,8 @@ let g:rails_gem_projections = {
       \ }
 
 let g:rails_projections = {
-      \   "app/services/*.rb": {"command": "service"}
+      \   "app/services/*.rb": {"command": "service"},
+      \   "app/extras/*.rb": {"command": "service"}
       \ }
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 " delimitMate