Add example usage for compare_engelsystem_shifts

README.md

@@ -107,17 +107,18 @@ By running `bin/rails <command>` you can trigger some helpful actions, such as
 
 - Promote user to shiftcoordinator
   ~~~ruby
-  u = User.find_by(name:"username_here")
-  u.shiftcoordinator = true
-  u.save!
+  User.find_by(name:"username_here").update(shiftcoordinator: true)
   ~~~
 
 - Reset user password
   ~~~ruby
   pw = SecureRandom.alphanumeric(12)
-  u = User.find_by(name:"username_here")
-  u.update(password: pw, password_confirmation: pw)
-  u.save!
+  User.find_by(name:"username_here").update(password: pw, password_confirmation: pw)
+  ~~~
+
+- Print differences between local assignments and those in the engelsystem (taking into account assignments in the "variant conferences")
+  ~~~ruby
+  Conference.find_by(slug:"38c3").compare_engelsystem_shifts([Conference.find_by(slug:"38c3-more"), Conference.find_by(slug: "38c3-orga")])
   ~~~
 
 - Send a test message to Telegram