As a user, I want to track my menstrual cycle in Health so I can securely and privately monitor my health

[thequailman]

Requirements

• [ ] Add menstrual cycle tracking (cycle length, period length, luteal phase, start, end, predict next cycle start)
  • [ ] HealthMenstrualCycle
    • [ ] AuthAccountID
    • [ ] CycleLength int
    • [ ] PeriodLength int
    • [ ] LutealPhase int
    • [ ] NextPeriod civildate
  • [ ] HealthMenstrualPeriod
    • [ ] AuthAccountID
    • [ ] StartDate CivilDate
    • [ ] EndDate CivilDate
• [ ] All data must be encrypted client side
• [ ] Add a toggle for notifications using local notifications functionality?
• [ ] Retention?