refactor: put the views into views folder

             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

             xmlns:local="clr-namespace:JuanLog"

             StartupUri="MainWindow.xaml">

             StartupUri="Views/MainWindow.xaml">

    <Application.Resources>

    </Application.Resources>

<Page x:Class="JuanLog.Views.Page1"

      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 

      xmlns:local="clr-namespace:JuanLog.Views"

      mc:Ignorable="d" 

      d:DesignHeight="450" d:DesignWidth="800"

      Title="Page1">

    <Grid>

    </Grid>

</Page>

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.Navigation;

using System.Windows.Shapes;

namespace JuanLog.Views

{

    /// <summary>

    /// Interaction logic for Page1.xaml

    /// </summary>

    public partial class Page1 : Page

    {

        public Page1()

        {

            InitializeComponent();

        }

    }

}