Adding the StackLayout for liking photos

The first thing to do is to add the StackLayout control for liking photos on the right-hand side of the control, as follows:

1. Open Controls/SwiperControl.xaml.
2. Add the following code under the comment <!-- StackLayout for like here -->:

<StackLayout x:Name="likeStackLayout" Grid.Column="2"
             Opacity="0" Padding="0, 100">
    <Label Text="LIKE" 
           TextColor="Lime" 
           FontSize="30" 
           Rotation="30" 
           FontAttributes="Bold" />
</StackLayout>

The StackLayout control is the container of child elements that we want to display. It has a name and is assigned to be rendered in the third column (it says Grid.Column="2" in the code, due to the zero indexing). The Opacity property is set to 0, making it completely invisible, and the Padding property is adjusted to...