MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d"
             x:Class="XamarinStudy.MainPage" Title="Effects">

    <StackLayout Margin="10,30,10,0" Spacing="20">
        <Image Source="banner.png"/>
        <Label Text="Effects" HorizontalOptions="CenterAndExpand" FontSize="Large"/>
        <Entry  HeightRequest="50"  Placeholder="Normal Entry"/>
    </StackLayout>

</ContentPage>