Bottom right float button

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 <AbsoluteLayout>
        
    <Grid AbsoluteLayout.LayoutBounds="0,0,1,1" AbsoluteLayout.LayoutFlags="All" >
    <Grid>

    <Border
        StrokeShape="RoundRectangle 30"
        HeightRequest="60"
        WidthRequest="60"
        BackgroundColor="Black"
        AbsoluteLayout.LayoutBounds="1, 1, AutoSize, AutoSize"
        AbsoluteLayout.LayoutFlags="PositionProportional"
        TranslationX="-30"
        TranslationY="-30"
        > 
            <Border.GestureRecognizers>
                <TapGestureRecognizer Tapped="AddButton_Clicked" />
            </Border.GestureRecognizers>
            <Label Text="➕"
                    TextColor="White"
                    VerticalOptions="Center"
                    HorizontalOptions="Center"
                    FontSize="25"/> 
    </Border>
</AbsoluteLayout>