add conference options to the broadcasts; implement auth to microsoft

app/helpers/broadcast_conferences_helper.rb

@@ -0,0 +1,17 @@
+module BroadcastConferencesHelper
+  def options_for_conference_select
+    [
+        ['Zoom', 'zoom'],
+        ['MS Teams', 'ms_teams']
+    ]
+  end
+
+  def conference_option_name_from_key(key)
+    option = options_for_conference_select.find { |option| option[1] == key }
+    if option.present?
+      option.first
+    else
+      'Unknown conference option'
+    end
+  end
+end