Execute
composer require hallowelt/simpletasks dev-REL1_35
within MediaWiki root or add hallowelt/simpletasks to the
composer.json file of your project
Add
wfLoadExtension( 'SimpleTasks' );
to your LocalSettings.php or the appropriate settings.d/ file.
Wikitext:
Assign This is task description to MyUser, with due date 2023-10-12
[] This is task description [[User:MyUser]] <datetime>2023-10-12</datetime>
Visual Mode:
Type [] which will create a checkbox, type description, then @ to assign the user and (optionally) type (space) // to set the due date