Adds the start of a new sample showcasing Cupertino widgets. (#12)

veggieseasons/README.md

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+# Veggie Seasons
+
+An app that shows which vegetables are currently in season. It showcases
+Flutter's Cupertino widgets, and nothing from Flutter's Material package
+is included in the app.
+
+**This sample is not currently in a finished state. We're in the process
+of building it out.**
+
+## Goals
+
+* Show how to build an interface that iOS users will feel right at home
+  with.
+* Show how Flutter's Cupertino widgets work together.
+
+## The important bits
+
+### `/screens/*`
+
+These are the screens presented in the app, roughly analogous to
+UIViewControllers. `HomeScreen` is the root, and the others are shown
+as the user navigates.
+
+### `/widgets/search_bar.dart`
+
+An example of how to construct an Cupertino-style search bar. The
+Flutter team [is working on an official widget](https://github.com/flutter/flutter/issues/9784)
+for this. Once that effort is complete, developers will not need to roll
+their own search bars, so to speak.
+
+## Questions/issues
+
+If you have a general question about any of the techniques you see in
+the sample, the best places to go are:
+
+* [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 an issue with the sample itself, please file an issue
+in the [main Flutter repo](https://github.com/flutter/flutter/issues).