Add Create Topic button to /categories page

app/serializers/category_list_serializer.rb

@@ -1,6 +1,6 @@
 class CategoryListSerializer < ApplicationSerializer
 
-  attributes :can_create_category
+  attributes :can_create_category, :can_create_topic
 
   has_many :categories, serializer: CategoryDetailedSerializer, embed: :objects
 
@@ -8,4 +8,8 @@ class CategoryListSerializer < ApplicationSerializer
     scope.can_create?(Category)
   end
 
+  def can_create_topic
+    scope.can_create?(Topic)
+  end
+
 end