Complete teams meeting creation and token refresh

db/migrate/20200817233053_add_microsoft_teams_meeting_join_url_to_broadcasts.rb

@@ -0,0 +1,5 @@
+class AddMicrosoftTeamsMeetingJoinUrlToBroadcasts < ActiveRecord::Migration[6.0]
+  def change
+    add_column :broadcasts, :microsoft_teams_meeting_url, :string
+  end
+end