[Feature Request] Add a roadmap

[mrlacey]

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

This control looks great but before I commit to using it in a project, I'd like to know a bit more about current and future plans.

Describe the solution you'd like

Add a roadmap document to the repository.
Give us an idea about plans for future releases, including timelines and the features/functionality they're likely to include.

Describe alternatives you've considered

Guessing isn't likely to be very accurate.
I know by doing this you're not making any guarantees, that plans change, and life happens but currently I have nothing to go on.

Additional context

I'm currently interested in the range selection capability and am wondering when this may be available. But other, future plans are of interest too. (e.g. are you planning on adding MAUI support?)