Rails best pratices

Ajoute de la gem rails_best_pratices

https://www.infinum.co/the-capsized-eight/articles/top-8-tools-for-ruby-on-rails-code-optimization-and-cleanup
Add some gems about clean code for ruby

https://www.infinum.co/the-capsized-eight/articles/top-8-tools-for-ruby-on-rails-code-optimization-and-cleanup