[Cupertino] Add Cupertino Sample

Samples/UIWidgetSample/Editor/CupertinoSampleWidget.cs

+using Unity.UIWidgets.animation;
+using Unity.UIWidgets.cupertino;
+using Unity.UIWidgets.editor;
+using Unity.UIWidgets.foundation;
+using Unity.UIWidgets.painting;
+using Unity.UIWidgets.ui;
+using Unity.UIWidgets.widgets;
+using UnityEditor;
+using UnityEngine;
+using Rect = UnityEngine.Rect;
+
+namespace UIWidgetsSample {
+    public class CupertinoSample : UIWidgetsEditorWindow {
+        [MenuItem("UIWidgetsTests/CupertinoSample")]
+        public static void gallery() {
+            GetWindow<CupertinoSample>();
+        }
+
+        protected override void OnEnable() {
+            FontManager.instance.addFont(Resources.Load<Font>("CupertinoIcons"), "CupertinoIcons");
+            base.OnEnable();
+        }
+
+        protected override Widget createWidget() {
+            Debug.Log("[Cupertino Sample] Created");
+            return new CupertinoSampleApp();
+        }
+    }
+
+
+    public class CupertinoSampleApp : StatelessWidget {
+        public override Widget build(BuildContext context) {
+            return new CupertinoApp(
+                theme: new CupertinoThemeData(
+                    textTheme: new CupertinoTextThemeData(
+                        navLargeTitleTextStyle: new TextStyle(
+                            fontWeight: FontWeight.bold,
+                            fontSize: 70f,
+                            color: CupertinoColors.activeBlue
+                        )
+                    )),
+                home: new CupertinoSampleWidget()
+            );
+        }
+    }
+
+    public class CupertinoSampleWidget : StatefulWidget {
+        public CupertinoSampleWidget(Key key = null) : base(key) { }
+
+        public override State createState() {
+            return new CupertinoSampleWidgetState();
+        }
+    }
+
+    public class CupertinoSampleWidgetState : State<CupertinoSampleWidget> {
+        public override Widget build(BuildContext context) {
+            return new CupertinoPageScaffold(
+                child: new Center(
+                    child: new Text("Hello Cupertino",
+                        style: CupertinoTheme.of(context).textTheme.navLargeTitleTextStyle
+                    )
+                )
+            );
+        }
+    }
+}

Samples/UIWidgetSample/Editor/CupertinoSampleWidget.cs.meta

+fileFormatVersion: 2
+guid: 92aa3442134248a38d03c2a24a8a9962
+timeCreated: 1566545424