Add model for ToDos

What needs to be modelled?

A model for ToDos is needed.

Why is a new model necessary?

To help students by having a list of Todos to do when they use the app for the first time.

This is only meant to be a small help/orientation for new students to have a list of things to do when they start their studies at a university.

It is not meant to be a replacement for actual ToDo apps or anything like that.