Add gemfile for metadata generation.
Add gemfile for metadata generation.

coderanger/foodcritic,clintoncwolfe/foodcritic,nathenharvey/foodcritic,offslinker/foodcritic,docwhat/foodcritic,askl56/foodcritic,chazzly/foodcritic,acrmp/foodcritic,pkang/foodcritic,Foodcritic/foodcritic,odcinek/foodcritic,akihiro17/foodcritic,tas50/foodcritic