add user_serializer

app/serializers/spree/wombat/user_serializer.rb

@@ -0,0 +1,30 @@
+require 'active_model/serializer'
+
+module Spree
+  module Wombat
+    # Accepts a Spree::User and serializes this to the Hub Customer format
+    class UserSerializer < ActiveModel::Serializer
+
+      attributes :id, :email, :firstname, :lastname
+      has_one :shipping_address, serializer: Spree::Wombat::AddressSerializer
+      has_one :billing_address, serializer: Spree::Wombat::AddressSerializer
+
+      def id
+        object.email
+      end
+
+      def email
+        object.email
+      end
+
+      def firstname
+        object.first_name if object.first_name.present?
+      end
+
+      def lastname
+        object.last_name if object.last_name.present?
+      end
+
+    end
+  end
+end