added application_decorator

Gemfile

@@ -42,6 +42,8 @@ gem 'acts_as_tree'
 # Use Capistrano for deployment
 # gem 'capistrano-rails', group: :development
 
+gem 'draper'
+
 group :development, :test do
   # Call 'byebug' anywhere in the code to
   # stop execution and get a debugger console

app/decorators/application_decorator.rb

@@ -0,0 +1,8 @@
+class ApplicationDecorator < Draper::Decorator
+  # Define methods for all decorated objects.
+  # Helpers are accessed through `helpers` (aka `h`). For example:
+  #
+  #   def percent_amount
+  #     h.number_to_percentage object.amount, precision: 2
+  #   end
+end