Add generators.

This seemed like the easiest place to start.

lib/generators/serializer/templates/serializer.rb

@@ -0,0 +1,8 @@
+<% module_namespacing  do -%>
+class <%= class_name %>Serializer < <%= parent_class_name %>
+  attributes <%= attributes_names.map(&:inspect).join(", ") %>
+end
+<% association_names.each do |attribute| -%>
+  has_one :<%= attribute %>
+<% end -%>
+<% end  -%>