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

veggieseasons/lib/data/veggie.dart

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+// Copyright 2018 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:meta/meta.dart';
+
+enum VeggieCategory {
+  legume,
+  tuber,
+  cruciferous,
+  gourd,
+  leafy,
+  berry,
+  stealthFruit,
+  tropical,
+  fruit,
+  melon,
+  stoneFruit,
+  fern,
+  citrus,
+  root,
+  allium,
+  fungus,
+  vegetable,
+}
+
+enum Season {
+  winter,
+  spring,
+  summer,
+  autumn,
+}
+
+final Map<VeggieCategory, String> veggieCategoryNames = {
+  VeggieCategory.legume: 'Legume',
+  VeggieCategory.tuber: 'Tuber',
+  VeggieCategory.cruciferous: 'Cruciferous',
+  VeggieCategory.gourd: 'Gourd',
+  VeggieCategory.leafy: 'Leafy',
+  VeggieCategory.berry: 'Berry',
+  VeggieCategory.stealthFruit: 'Stealth fruit',
+  VeggieCategory.tropical: 'Tropical',
+  VeggieCategory.fruit: 'Fruit',
+  VeggieCategory.melon: 'Melon',
+  VeggieCategory.stoneFruit: 'Stone fruit',
+  VeggieCategory.fern: 'Technically fern',
+  VeggieCategory.citrus: 'Citrus',
+  VeggieCategory.root: 'Root vegetable',
+  VeggieCategory.allium: 'Allium',
+  VeggieCategory.fungus: 'Fungus',
+  VeggieCategory.vegetable: 'Vegetable',
+};
+
+class Veggie {
+  Veggie({
+    @required this.id,
+    @required this.name,
+    @required this.imageAssetPath,
+    @required this.category,
+    @required this.shortDescription,
+    @required this.accentColor,
+    @required this.seasons,
+    this.isFavorite = false,
+  });
+
+  final int id;
+
+  final String name;
+
+  /// Each veggie has an associated image asset that's used as a background
+  /// image and icon.
+  final String imageAssetPath;
+
+  final VeggieCategory category;
+
+  final String shortDescription;
+
+  /// A color value to use when constructing UI elements to match the image
+  /// found at [imageAssetPath].
+  final int accentColor;
+
+  /// Seasons during which a veggie is harvested.
+  final List<Season> seasons;
+
+  /// Whether or not the veggie has been saved to the user's garden (i.e. marked
+  /// as a favorite).
+  bool isFavorite;
+}