add conference options to the broadcasts; implement auth to microsoft

spec/features/user_managing_broadcasts_spec.rb

@@ -25,6 +25,7 @@ feature 'User managing broadcasts' do
 
       by 'filling out the form' do
         fill_in broadcast_name_field, with: 'My Broadcast'
+        select_conference_option('Zoom')
         select_time_zone("New Delhi")
       end
 
@@ -352,5 +353,10 @@ feature 'User managing broadcasts' do
     t 'broadcasts.file.actions.delete_file'
   end
 
+  def select_conference_option(value)
+    if value.present?
+      select value, from: "broadcast[conference_option]"
+    end
+  end
 
 end