Added Chrome OS Best Practices Sample (#74)

chrome-os-best-practices/README.md

@@ -0,0 +1,40 @@
+# Chrome OS Best Practices
+
+A Flutter sample app that builds upon the Friendlychat codelab to show how to build a responsive app that works well on Chrome OS
+
+## Goals for this sample
+
+* Showcase how to build an app that works well on Chrome OS including:
+    * Changing layouts on screen size and handling resizing well
+    * Keyboard navigation support (coming soon!)
+    * Deeper mouse/trackpad support: Right click support etc... (coming soon!)
+
+## The important bits
+
+### `main.dart`
+
+As of now, the main thing to look at is the main build method where we use layout builder to determine which layouts to build
+```
+body: LayoutBuilder(
+        builder: (context, constraints) {
+          final double width = constraints.maxWidth;
+          debugPrint('width: $width');
+          if (constraints.maxWidth > 800)
+            return TwoPaneChatLayout(chatEntries: chats);
+          else
+            return ChatListScreen(chatEntries: chats);
+        },
+      ),
+```
+## Questions/issues
+
+If you have a general question about building for Chrome OS in Flutter, 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).
+