Join links for user registration

config/routes.rb

@@ -3,6 +3,19 @@ Rails.application.routes.draw do
 
   resource :session
 
+  resource :account do
+    scope module: "accounts" do
+      resource :join_code
+
+      resources :users
+    end
+  end
+
+  get "join/:join_code", to: "users#new", as: :join
+  post "join/:join_code", to: "users#create"
+
+  resources :users
+
   resources :projects do
     resource :access, controller: "projects/accesses"