Add placeholder routes and methods

Author: andysellick

app/controllers/html_publication_controller.rb

@@ -0,0 +1,5 @@
+class HtmlPublicationController < ContentItemsController
+  include Cacheable
+
+  def show; end
+end

app/views/html_publication/show.html.erb

@@ -0,0 +1 @@
+<p>placeholder</p>

config/routes.rb

@@ -147,6 +147,11 @@
     get ":slug/:division", to: "calendar#division", as: :division
   end
 
+  # HTML publications
+  constraints FullPathFormatRoutingConstraint.new("html_publication") do
+    get "*path(.:locale)", to: "html_publication#show"
+  end
+
   # Local Transaction pages
   constraints FormatRoutingConstraint.new("local_transaction") do
     get ":slug", to: "local_transaction#index", as: "local_transaction_search"