add save functionality to attendance. then uncomment the line below.

The puzzle `59-7f4a1a97` from #59 has to be resolved:

https://github.com/ammaratef45/Attendance/blob/e740acd6ece54dbcf05581ecdf1a34e382a09947/attendance/lib/AttendanceDatailsPage/attendance_details_page_viewmodel.dart#L47-L48

The puzzle was created by Ammar Atef on 08-May-19.

If you have any technical questions, don't ask me, submit new tickets instead. The task will be \"done\" when the problem is fixed and the text of the puzzle is _removed_ from the source code. Here is more about [PDD](http://www.yegor256.com/2009/03/04/pdd.html) and [about me](http://www.yegor256.com/2017/04/05/pdd-in-action.html).