Improve Track Mensuration Feature

[yellowHatpro]

• Add a Calender view that shows and lets one select the last period date, and on its basis notify the user about the periods 5 days before the next expected cycle. If the user already had periods, the new date should be added to the calendar, otherwise, it should show no. of days elapsed, since the expected date.
• Take avg cycle of 28 days.
• Implement Notifications for notifying the user.
• You can also work on UI improvement.