Add routing for fetching article details

Author: Sebastian Wilgosz

config/routes.rb

@@ -2,5 +2,5 @@
 
 Rails.application.routes.draw do
   # get '/articles', to: 'articles#index'
-  resources :articles, only: [:index]
+  resources :articles, only: %i[index show]
 end

spec/routing/articles_spec.rb

@@ -12,4 +12,8 @@
       )
     end
   end
+
+  it 'routes to articles#show' do
+    expect(get('/articles/1')).to route_to('articles#show', id: '1')
+  end
 end