added brands

front-api/models/brand.rb

@@ -0,0 +1,3 @@
+class Brand < ActiveRecord::Base
+    has_many :items
+end

front-api/models/item.rb

@@ -1,5 +1,6 @@
 class Item < ActiveRecord::Base
   belongs_to :unit
+  belongs_to :brand
   has_many :multi_media_descriptions
   belongs_to :sub_category