Updating README. (flutter#2)

README.md

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+# Flutter samples
+
+A collection of open source samples that illustrate best practices for
+[Flutter](https://flutter.io).
+
+This repo will be getting significantly larger as Flutter progresses toward 1.0.
+
+## Index
+
+### [`jsonexample`](jsonexample)
+
+A simple app that deserializes a set of JSON strings using three
+different libraries: `dart:convert`, `json_serializable`, and `built_value`.
+
+## Questions or issues?
+
+If you have a general question about one of these samples or how to adapt its
+techniques for one of your own apps, try one of these resources:
+
+* [The FlutterDev Google Group](https://groups.google.com/forum/#!forum/flutter-dev)
+* [The Flutter Gitter channel](https://gitter.im/flutter/flutter)
+* [StackOverflow](https://stackoverflow.com/questions/tagged/flutter)
+
+If you run into a bug in one of the samples, please file an issue in the
+[main Flutter repo](https://github.com/flutter/flutter/issues).