add routes and empty index for discover

app/controllers/discover_controller.rb

@@ -1,2 +1,7 @@
 class DiscoverController < ApplicationController
+  before_filter :authenticate_user!
+  
+  def index
+
+  end
 end

app/views/discover/index.html.haml

@@ -0,0 +1 @@
+ 

config/routes.rb

@@ -90,6 +90,7 @@ Rails.application.routes.draw do
     match '/unsubscribe', to: 'subscription#unsubscribe', via: :post, as: :unsubscribe_answer
   end
 
+  match '/discover', to: 'discover#index', via: :get, as: :discover
   match '/public', to: 'public#index', via: :get, as: :public_timeline
   match '/group/:group_name', to: 'group#index', via: :get, as: :group_timeline