Add bootstrap and main application template

spec/requests/root_spec.rb

@@ -6,6 +6,11 @@ RSpec.describe "Root path", type: :request do
       get root_path
       expect(response).to have_http_status(200)
     end
+
+    it "should have a link to the dictionary" do
+      get root_path
+      expect(response.body).to have_selector(%(a[href="#{dictionary_index_path}"]))
+    end
   end
 
   describe "logged out" do