Add a android & ios notificaiton example.

Author: Javen

example/main/java/cn/jpush/api/examples/PushExample.java

@@ -13,6 +13,7 @@
 import cn.jpush.api.push.model.PushPayload;
 import cn.jpush.api.push.model.audience.Audience;
 import cn.jpush.api.push.model.audience.AudienceTarget;
+import cn.jpush.api.push.model.notification.AndroidNotification;
 import cn.jpush.api.push.model.notification.IosNotification;
 import cn.jpush.api.push.model.notification.Notification;
 
@@ -78,6 +79,21 @@ public static PushPayload buildPushObject_android_tag_alertWithTitle() {
                 .build();
     }
 
+    public static PushPayload buildPushObject_android_and_ios() {
+        return PushPayload.newBuilder()
+                .setPlatform(Platform.android_ios())
+                .setAudience(Audience.tag("tag1"))
+                .setNotification(Notification.newBuilder()
+                		.setAlert("alert content")
+                		.addPlatformNotification(AndroidNotification.newBuilder()
+                				.setTitle("Android Title").build())
+                		.addPlatformNotification(IosNotification.newBuilder()
+                				.incrBadge(1)
+                				.addExtra("extra_key", "extra_value").build())
+                		.build())
+                .build();
+    }
+    
     public static PushPayload buildPushObject_ios_tagAnd_alertWithExtrasAndMessage() {
         return PushPayload.newBuilder()
                 .setPlatform(Platform.ios())