Adding Rally App to Flutter Samples (#135)

material_studies/rally/lib/formatters.dart

@@ -0,0 +1,21 @@
+// Copyright 2019-present the Flutter authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import 'package:intl/intl.dart';
+
+class Formatters {
+  static final NumberFormat usd = NumberFormat.currency(name: '');
+  static final NumberFormat usdWithSign = NumberFormat.currency(name: '\$');
+  static final DateFormat date = DateFormat('MM-dd-yy');
+}