Currently there's no sharing functionality in Todoist, but we're actually working on it as we speak so you will soon be able to share a project with another Todoist user, assign tasks to them and more :)
Sounds exciting. This is exactly what has been holding me up from using Todoist. What is the schedule for this?
There is no timeframe set for this but we are hoping for it to be quite soon. Hoping for within the year.