Added main structure

GifResizer/Views/MainWindow.xaml

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+<Window x:Class="GifResizer.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"
+        mc:Ignorable="d"
+        Title="Gif resizer" Height="480" Width="640"
+        ResizeMode="NoResize">
+    
+    <Border BorderBrush="Gray" 
+            BorderThickness="1" 
+            CornerRadius="5"
+            Padding="5"
+            Margin="20">
+        
+        <StackPanel Orientation="Vertical" Margin="20">
+
+            <Border BorderBrush="Gray" 
+                    BorderThickness="1" 
+                    CornerRadius="5"
+                    Padding="5"
+                    Margin="20">
+                <StackPanel Orientation="Vertical">
+                    <TextBlock
+                        Margin="0,0,0,5"
+                        Text="{
+                            Binding FilePath,
+                            TargetNullValue=No file selected,
+                            FallbackValue=Gif filepath...
+                        }"
+                        Width="Auto" 
+                        Height="Auto"
+                        HorizontalAlignment="Left"
+                        VerticalAlignment="Center"
+                    />
+                    <Button 
+                        Content="Browse..."
+                        Padding="5"
+                        Width="Auto" 
+                        Height="Auto"
+                        Click="BrowseButton_Click"
+                        HorizontalAlignment="Center"
+                        VerticalAlignment="Center"/>
+                    
+                </StackPanel>
+            </Border>
+            
+            <Button 
+                Content="Resize"
+                Padding="5"
+                Width="Auto" 
+                Height="Auto"
+                Click="ResizeButton_Click"
+                HorizontalAlignment="Center"
+                VerticalAlignment="Center"/>
+
+            <!--
+            <TextBlock Grid.Row="3" Text="Options:" Margin="0,0,0,5"/>
+     
+            <CheckBox Grid.Row="4" 
+                      Content="Optimize file size"
+                      Margin="0,0,0,15"/>
+
+            <Button Grid.Row="5" 
+                    Content="Resize GIF" 
+                    Width="120" 
+                    Height="35"
+                    HorizontalAlignment="Left"
+                    VerticalAlignment="Top"/>
+            -->
+        </StackPanel>
+    </Border>
+</Window>

GifResizer/Views/MainWindow.xaml.cs

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+using System.Windows;
+using GifResizer.ViewModels;
+using Microsoft.Win32;
+
+namespace GifResizer.Views;
+
+/// <summary>
+/// Interaction logic for MainWindow.xaml
+/// </summary>
+public partial class MainWindow : Window
+{
+    
+    private readonly MainViewModel _mainViewModel;
+    
+    public MainWindow(MainViewModel viewModel)
+    {
+        InitializeComponent();
+        _mainViewModel = viewModel;
+        DataContext = _mainViewModel;
+        
+    }
+    
+    private void BrowseButton_Click(object sender, RoutedEventArgs e)
+    {
+        OpenFileDialog fileDialog = new OpenFileDialog
+        {
+            Filter = "GIF files (*.gif)|*.gif|All files (*.*)|*.*",
+            Title = "Select a GIF file"
+        };
+        
+        if (fileDialog.ShowDialog() == true)
+        {
+            _mainViewModel.FilePath = fileDialog.FileName;
+        }
+    }
+    
+    private void ResizeButton_Click(object sender, RoutedEventArgs e)
+    {
+    }
+}