add sync API with swagger documentation at /api

config/initializers/rswag_ui.rb

@@ -0,0 +1,3 @@
+Rswag::Ui.configure do |config|
+  config.swagger_endpoint "/api/swagger", "Sanasto Wiki API"
+end

config/routes.rb

@@ -51,6 +51,9 @@ Rails.application.routes.draw do
     end
   end
 
+  mount Api::Base => "/api"
+  mount Rswag::Ui::Engine => "/api"
+
   resources :entries do
     resources :comments, only: [ :create ]
     collection do