add Dart Pad hello world example screenshot #15 (comment)

nelsonic · nelsonic · commit cfe5fda8826d · 2020-06-12T15:45:55.000+01:00
diff --git a/README.md b/README.md
@@ -171,6 +171,8 @@ Hello World!
 
 Try it: https://dartpad.dartlang.org/fa6f6e5a7b9406e88b31a17e82655ef8
 
+![dart-pad-hello-world-example](https://user-images.githubusercontent.com/194400/84514887-a54b5800-acc3-11ea-80bf-4ca4f39d1869.png)
+
 
 <br />
 
