Add properties to template for Qt Quick Application.

It imitate template for Qt Quick Controls Application.

Change-Id: I3440c96f06f3607b43811399427e341e73dea657
Reviewed-by: Alessandro Portale <alessandro.portale@theqtcompany.com>

share/qtcreator/templates/wizards/projects/qmake/qtquickapplication/main.qml.tpl

@@ -3,6 +3,9 @@ import QtQuick.Window %{QtQuickWindowVersion}
 
 Window {
     visible: true
+    width: 640
+    height: 480
+    title: qsTr("Hello World")
 
 @if %{IsUiFileInUse}
     MainForm {