sending notification to selected user in Django

I am working on a part of a project that when I create a group for a project and once I submit the form (where I can pick certain users to be in the group in the form), the users who I selected in the form will receive any type of notification. The idea I am having now is when the selected users log in, their web pages will receive the notification that they are selected to the group.

I have looked at Django's message frameworks however, it seems like they don't have the information that I am looking for. Can anyone please give me suggestion on where to start and what should I look at? I am an extreme noob in Django so please help !