Add test form in development mode

This helps to test submissions in development mode

config/routes.rb

@@ -2,6 +2,9 @@ Rails.application.routes.draw do
   # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
 
   resources :forms do
+    if Rails.env.development?
+      member { get :form }
+    end
     resources :submissions
   end
   # short link for submission file uploads