🏗 Enhancement Proposal: Radio Button, Check Box Button Example

## 🏗 Enhancement Proposal

Examples of Radio Button, Radio Button Group, Check Box Button Group in Example Project or Documentation

### Pitch

Current documentation doesn't work out of the box and there are no working examples in the Example project either.
Giving examples would make it easier to implement your library.

### Platforms affected (mark all that apply)
- [X] :iphone: iOS
- [X] :robot: Android
- [X] :checkered_flag: WPF
- [X] :earth_americas: UWP
- [X] :apple: MacOS
- [X] :tv: tvOS
- [X] :monkey: Xamarin.Forms

Start by reviewing the current documentation and Example project for Radio Button, Radio Button Group, and Check Box Button Group usage across the listed platforms. Done means the documentation or examples work out of the box and cover the requested controls.

Written by the indexing model from the issue text.