refactor: re-add once for fixing windows case-insensitive issue.

BallanceTasEditor/Views/MainWindow.xaml

@@ -0,0 +1,12 @@
+<Window x:Class="BallanceTasEditor.Views.MainWindow"
+        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:BallanceTasEditor.Views"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800" Icon="/Assets/App.ico">
+    <Grid>
+        
+    </Grid>
+</Window>

BallanceTasEditor/Views/MainWindow.xaml.cs

@@ -0,0 +1,25 @@
+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 BallanceTasEditor.Views {
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window {
+        public MainWindow() {
+            InitializeComponent();
+        }
+    }
+}