[Feature Request] Outline color for selected date

[viciousnemesis]

Is your feature request related to a problem? Please describe.
Selection of a date can be a bit confusing. It's not exactly clear in your example photos that the selected date is the blue circle, and today is the one circled in pink.

Describe the solution you'd like
A property to outline/circle the date selected by the user, in the color provided. Similar to TodayOutlineColor but for SelectedDate.

Describe alternatives you've considered
Setting TodayOutlineColor to transparent helps, but it would be more clear, in my opinion, to circle the date the user chose.