The `taskadd` userscript adds a task based on the current title and URL.
It passes additional arguments along to `task`.
For example:
:spawn --userscript taskadd due:eod pri:H
will add a task with high priority due at the end of the day.
The description will be the current page title and it will be annotated
with the current page url.
If used with hints, the hint text is used as the description.
Unfortunately, there is currently no way to use :hint fill and maintain
the hint text, which limits the ability to provide additional args in
hint mode.
