Add about page with attributions

app/views/pages/about.html.erb

@@ -5,3 +5,7 @@ This web application was created with
 <%= link_to('Rails Composer', 'http://railsapps.github.io/rails-composer/') %>
 from the <%= link_to('RailsApps project', 'http://railsapps.github.io/') %>.
 </p>
+<p>
+The domain name address was obtained from Afraid.org
+<%= link_to('Free DNS', 'https://freedns.afraid.org/') %>
+</p>

app/views/visitors/index.html.haml

@@ -5,3 +5,4 @@
   = link_to 'Play Now', play_now_path
   = link_to 'Browse Tables', tables_path
   = link_to 'Tutorial', tutorial_path
+  = link_to 'About', page_path('about')