Implemented core logic

GifResizer/ViewModels/MainViewModel.cs

@@ -1,17 +1,20 @@
 using System.ComponentModel;
 using System.IO;
 using System.Runtime.CompilerServices;
+using GifResizer.Models;
+using GifResizer.Service;
 
 namespace GifResizer.ViewModels;
 
 public class MainViewModel : INotifyPropertyChanged
 {
     
-
+    private readonly ResizeService _resizeService;
     public event PropertyChangedEventHandler? PropertyChanged;
     
-    public MainViewModel()
+    public MainViewModel(ResizeService service)
     {
+        _resizeService = service;
         FilePath = Directory.GetCurrentDirectory();
     }
 
@@ -21,6 +24,11 @@ public class MainViewModel : INotifyPropertyChanged
         get;
         set => SetField(ref field, value);
     }
+
+    public void ResizeGif(int width, int height)
+    {
+        _resizeService.ResizeGif(FilePath, width, height);
+    }
     
     private bool SetField<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
     {