Add support fo [/] and [%] cookies for TODOs and DONEs

[gerazov]

Does this feature exist in Emacs orgmode core?

N/A

Orgmode link

No response

Feature value

It would be useful to have this for large tasks with subtasks that can be scheduled in time.

It's related to #287 in which support for nested list items was added.

Additional context

No response

[mcepl]

Yes, it does exist in the Emacs orgmode, that’s how orgmode works. E.g., this should work:

** TODO my task [/]
*** TODO which has a subtask