Adds new image assets, card-style list, and new data for the veggies (#38)

veggieseasons/lib/widgets/veggie_card.dart

@@ -0,0 +1,77 @@
+// 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:flutter/cupertino.dart';
+import 'package:veggieseasons/data/veggie.dart';
+import 'package:veggieseasons/screens/details.dart';
+import 'package:veggieseasons/styles.dart';
+
+class VeggieCard extends StatelessWidget {
+  VeggieCard(this.veggie, this.isPreferredCategory);
+
+  /// Veggie to be displayed by the card.
+  final Veggie veggie;
+
+  /// Whether [veggie] falls into one of user's preferred [VeggieCategory]s
+  final bool isPreferredCategory;
+
+  List<Widget> _buildStackChildren() {
+    final widgets = <Widget>[];
+
+    widgets.add(Hero(
+      tag: veggie.id,
+      child: Image.asset(
+        veggie.imageAssetPath,
+        fit: BoxFit.cover,
+      ),
+    ));
+
+    widgets.add(Positioned(
+      bottom: 0.0,
+      left: 0.0,
+      right: 0.0,
+      child: DecoratedBox(
+        decoration: BoxDecoration(
+          color: veggie.accentColor,
+        ),
+        child: Padding(
+          padding: const EdgeInsets.all(16.0),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: <Widget>[
+              Text(
+                veggie.name,
+                style: Styles.cardTitleText,
+              ),
+              Text(
+                veggie.shortDescription,
+                style: Styles.cardDescriptionText,
+              ),
+            ],
+          ),
+        ),
+      ),
+    ));
+
+    return widgets;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+      onTap: () {
+        Navigator.of(context).push(CupertinoPageRoute(
+          builder: (context) => DetailsScreen(veggie.id),
+          fullscreenDialog: true,
+        ));
+      },
+      child: ClipRRect(
+        borderRadius: BorderRadius.circular(10.0),
+        child: Stack(
+          children: _buildStackChildren(),
+        ),
+      ),
+    );
+  }
+}