Adding Rally App to Flutter Samples (#135)

material_studies/rally/README.md

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+# Rally
+
+A Flutter sample app based on the Material study Rally (a hypothetical, personal finance app). It
+showcases custom tabs, custom painted widgets, and custom animations.
+
+For info on the Rally Material Study, see: https://material.io/design/material-studies/rally.html
+
+## Goals
+
+* Show how to customize a tab bar.
+* Show how to create reusable custom widgets with composition and custom painting.
+* Show how to create an app with tabs and child navigation screens.
+
+## The important bits
+
+### `/charts/*`
+
+These are the custom charts. The circle chart and line chart are custom painters,
+while the single vertical bar chart is a simple composition of boxes.
+
+### `/sections/*`
+
+These are the main sections for the tab views and the child screen with the details and line chart.
+The financial entity is a reusable screen that is the base for the accounts, bills, and budgets
+screens.
+
+## 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).