public ItemsViewModel()
        {
            Title            = "Browse";
            Items            = new ObservableCollection <Item>();
            LoadItemsCommand = new Command(async() => await ExecuteLoadItemsCommand());

            MessagingCenter.Subscribe <NewItemPage, Item>(this, "AddItem", async(obj, item) =>
            {
                var newItem = item as Item;
                Items.Add(newItem);
                await ItemStore.AddItemAsync(newItem);
            });
        }
        public ItemsViewModel()
        {
            Title            = "My Fridge";
            Items            = new ObservableCollection <Item>();
            DBItems          = new ObservableCollection <string>();
            LoadItemsCommand = new Command(async() => await ExecuteLoadItemsCommand());
            var listView = new ListView
            {
                ItemTemplate = new DataTemplate(typeof(InventoryItemCell))
            };

            MessagingCenter.Subscribe <NewItemPage, Item>(this, "AddItem", async(obj, item) =>
            {
                var newItem = item as Item;
                Items.Add(newItem);
                await ItemStore.AddItemAsync(newItem);
            });
        }