Add project files.

WPFUI/Views/ShellView.xaml

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+<Window x:Class="WPFUI.Views.ShellView"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:WPFUI.Views"
+        mc:Ignorable="d"
+        Title="ShellView" Height="450" Width="800">
+    <Grid>
+        
+    </Grid>
+</Window>

WPFUI/Views/ShellView.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace WPFUI.Views
+{
+    /// <summary>
+    /// Interaction logic for ShellView.xaml
+    /// </summary>
+    public partial class ShellView : Window
+    {
+        public ShellView()
+        {
+            InitializeComponent();
+        }
+    }
+}