MacTwitterDemo from: https://github.com/xamarin/Xamarin.Forms/blob/macOS/Xamarin.Forms.Controls/MacTwitterDemo.xaml

MacTwitterDemo.xaml

<?xml version="1.0" encoding="UTF-8"?>
<MasterDetailPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="Xamarin.Forms.Controls.MacTwitterDemo">
    <MasterDetailPage.Master>
        <ContentPage BackgroundColor="#24456e" Title="Master">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition />
                    <RowDefinition Height="50" />
                </Grid.RowDefinitions>
                <ScrollView Margin="0,55,0,0" BackgroundColor="Transparent">
                    <StackLayout>
                        <Image Source="rui.jpg" WidthRequest="50" HeightRequest="50" HorizontalOptions="Center" />
                        <Image Source="home.png" Margin="0,20,0,0" WidthRequest="25"/>
                        <Image Source="notifications.png" Margin="0,20,0,0" WidthRequest="25"/>
                        <Image Source="messages.png" Margin="0,20,0,0" WidthRequest="22"  />
                        <Image Source="profile.png" Margin="0,20,0,0" WidthRequest="25" />
                        <Image Source="lists.png" Margin="0,20,0,0" WidthRequest="25" HeightRequest="25"  />
                        <Image Source="search.png" Margin="0,20,0,0" WidthRequest="25" />
                    </StackLayout>
                </ScrollView>
                <Image Grid.Row="1" Source="tweet.png" WidthRequest="25" HeightRequest="25" VerticalOptions="Start" />
            </Grid>
        </ContentPage>
    </MasterDetailPage.Master>
    <MasterDetailPage.Detail>
        <ContentPage BackgroundColor="#ffffff" Title="Home">
            <ListView x:Name="lstTweets" RowHeight="125" BackgroundColor="#ffffff">
                <ListView.Header>
                    <Grid HeightRequest="45"  BackgroundColor="#ffffff">
                        <Grid.RowDefinitions>
                            <RowDefinition />
                            <RowDefinition Height="0.5" />
                        </Grid.RowDefinitions>
                        <Label Text="Home" FontFamily="Helvetica" FontSize="14" VerticalOptions="CenterAndExpand" VerticalTextAlignment="Center"  HorizontalOptions="CenterAndExpand" />
                        <BoxView Color="#cbd5dd" Grid.Row="1" HeightRequest="1" HorizontalOptions="FillAndExpand" />
                    </Grid>
                </ListView.Header>
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <Grid BackgroundColor="White" Padding="0,5,0,5" RowSpacing="3">
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto" />
                                    <RowDefinition Height="*" />
                                    <RowDefinition Height="Auto" />
                                    <RowDefinition Height="0.5" />
                                </Grid.RowDefinitions>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="50" />
                                    <ColumnDefinition Width="*" />
                                </Grid.ColumnDefinitions>
                                <Image Source="xamarinlogo.png" Grid.RowSpan="3" Margin="0,5,0,0" WidthRequest="50" HeightRequest="50" VerticalOptions="Start">
                                </Image>
                                <Label FontFamily="Helvetica" FontSize="15" Grid.Column="1" Grid.Row="0" Text="Xamarin" VerticalOptions="Start" VerticalTextAlignment="Start">
                                </Label>
                                <Label Grid.Column="1" FontFamily="Helvetica" FontSize="14" Grid.Row="1" Text="Download the source code for the #XamarinEvolve 2016 app, leveraging 93% codeshare across iOS, Android, and Windows: http://xmn.io/26xD51i ">
                                </Label>
                                <StackLayout HorizontalOptions="Start" Spacing="40" VerticalOptions="Center" Orientation="Horizontal" Grid.Column="1" Grid.Row="2" Padding="0,10,0,10">
                                    <Image Source="reply.png" HeightRequest="15" WidthRequest="15" VerticalOptions="Center" HorizontalOptions="Start" />
                                    <Image Source="retweet.png" HeightRequest="15" WidthRequest="15" VerticalOptions="Center" HorizontalOptions="Start" />
                                    <Image Source="favorite.png" HeightRequest="15" WidthRequest="15" VerticalOptions="Center" HorizontalOptions="Start" />
                                </StackLayout>
                                <BoxView Color="#cbd5dd" Grid.Row="3" Grid.ColumnSpan="2" HorizontalOptions="FillAndExpand" />
                            </Grid>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </ContentPage>
    </MasterDetailPage.Detail>
</MasterDetailPage>