Add omniauth saml section for sign in and sign up page

Co-authored-by: Anamika Aggarwal <anamikaagg18@gmail.com>

app/controllers/users/omniauth_callbacks_controller.rb

@@ -1,4 +1,6 @@
 class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
+  skip_before_action :verify_authenticity_token, only: :saml
+
   def twitter
     sign_in_with :twitter_login, :twitter
   end
@@ -15,6 +17,10 @@ class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
     sign_in_with :wordpress_login, :wordpress_oauth2
   end
 
+  def saml
+    sign_in_with :saml_login, :saml
+  end
+
   def after_sign_in_path_for(resource)
     if resource.registering_with_oauth
       finish_signup_path