Collaborative Todos? (beginner question)

[Karantula]

Not an issue in itself, but what would be the right direction to take if I want to make a Todo that 2 or more users share? And than start adding info on who changed what, on the same page (/tasks)?

Sorry if it is too broad of a question, looking to get some idea before I break the whole thing for myself and have to do yet another reinstall