Adds model layer and list view to veggieseasons. (#13)

veggieseasons/lib/widgets/veggie_headline.dart

@@ -0,0 +1,74 @@
+// 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/styles.dart';
+
+class VeggieHeadline extends StatelessWidget {
+  final Veggie veggie;
+
+  const VeggieHeadline(this.veggie);
+
+  List<Widget> _buildSeasonDots(List<Season> seasons) {
+    List<Widget> widgets = <Widget>[];
+
+    for (Season season in seasons) {
+      widgets.add(SizedBox(width: 4.0));
+      widgets.add(
+        Container(
+          height: 10.0,
+          width: 10.0,
+          decoration: BoxDecoration(
+            color: Styles.seasonColors[season],
+            borderRadius: BorderRadius.circular(5.0),
+          ),
+        ),
+      );
+    }
+
+    return widgets;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+      onTap: () {
+        /* TODO(redbrogdon): navigation forthcoming */
+      },
+      child: Row(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          SizedBox(
+            width: 80.0,
+            height: 80.0,
+            child: ClipRRect(
+              borderRadius: BorderRadius.circular(10.0),
+              child: Image.asset(
+                veggie.imageAssetPath,
+                fit: BoxFit.fitWidth,
+              ),
+            ),
+          ),
+          SizedBox(width: 8.0),
+          Flexible(
+            child: Column(
+              mainAxisAlignment: MainAxisAlignment.start,
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Row(
+                  children: <Widget>[
+                    Text(veggie.name, style: Styles.headlineName),
+                  ]..addAll(_buildSeasonDots(veggie.seasons)),
+                ),
+                Text(veggie.shortDescription,
+                    style: Styles.headlineDescription),
+              ],
+            ),
+          )
+        ],
+      ),
+    );
+  }
+}