Add Fast Habbit Tracking Service

[makkahwi]

Is your feature request related to a problem? Please describe.
I diet-related habbit of fasting needs be tracked and noted, at lest to explain meals consumption time changes.

Describe the solution you'd like
A simple service of inputting a date as a day of fasting. It could be included @ dashboard view. And fasting time could be calculated by interacting first-meal or water drinking time & wakeup time.

Describe alternatives you've considered
To add a general day-based notes service to note fasting among other things like being sick. But it's better to split fasting.