Add task followers who are following the task progress from the system but aren't assigned to the task: For example someone created a task but he isn't assigned to work on it. When you add followers, they will be able to: 1 - Receive notification from the task they have been added as follower. 2- Upload files, comment, mention and can be mentioned. 3- permission to add sub tasks (Can assign sub tasks to only assigned users and can't add followers). 4- Can check the task overview. 5- followers can't start timer. 6- if the task is within a project the followers should be within the project members. 7- Assigned members can't be added as followers.