Added main structure

GifResizer/ViewModels/MainViewModel.cs

@@ -0,0 +1,37 @@
+using System.ComponentModel;
+using System.IO;
+using System.Runtime.CompilerServices;
+
+namespace GifResizer.ViewModels;
+
+public class MainViewModel : INotifyPropertyChanged
+{
+    
+
+    public event PropertyChangedEventHandler? PropertyChanged;
+    
+    public MainViewModel()
+    {
+        FilePath = Directory.GetCurrentDirectory();
+    }
+
+
+    public string FilePath
+    {
+        get;
+        set => SetField(ref field, value);
+    }
+    
+    private bool SetField<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
+    {
+        if (EqualityComparer<T>.Default.Equals(field, value)) return false;
+        field = value;
+        OnPropertyChanged(propertyName);
+        return true;
+    }
+    
+    protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null)
+    {
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+    }
+}