Is your feature request related to a problem? Please describe.

Describe the solution you'd like
I'd love the ability to add a BadgeView to each calendar item. Effectively I'd like to add icons or numbers to specific dates in order to glean more information at a glance. The badge view should be bound to an interface IBadgeView { DateTimeOffset Date{ get; } } where the required value is the date and the concretion can have arbitrary data that is bound to the SelectorTemplate of the BadgeView

Describe alternatives you've considered

Additional context (Optional)

Use Case 1:
Creating multiple entries in a database for a given date, It would be nice to be able to put the "Entry Count" as a numeric value on the calendar for that date.

Use Case 2:
An entry for a given date has a state (let's use "yes" and "no" for this example). It would be nice to be able to display a ✔️ or an ❌ on the calendar for that date.