Add Flutter Community banner.

Author: jeroen-meijer

README.md

@@ -1,3 +1,5 @@
+[![Flutter Community: native_widgets](https://fluttercommunity.dev/_github/header/native_widgets)](https://github.com/fluttercommunity/community)
+
 [![Buy Me A Coffee](https://img.shields.io/badge/Donate-Buy%20Me%20A%20Coffee-yellow.svg)](https://www.buymeacoffee.com/rodydavis)
 [![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=WSH3GVC49GNNJ)
 
@@ -15,4 +17,4 @@ Android will use Material Design and iOS will use Cupertino style widgets.
 
 To use this plugin, add `native_widgets` as a [dependency in your pubspec.yaml file](https://flutter.io/platform-plugins/).
 
-Look at the example for various ways to use this plugin!
+Look at the example for various ways to use this plugin!