add example code to experiment with dart/flutter

analysis_options.yaml

@@ -0,0 +1,11 @@
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  rules:
+    avoid_print: false
+    prefer_const_constructors_in_immutables: false
+    prefer_const_constructors: false
+    prefer_const_literals_to_create_immutables: false
+    prefer_final_fields: false
+    unnecessary_breaks: true
+    use_key_in_widget_constructors: false