Implemented gif exportation and added some style (again)

GifResizer/Models/GifData.cs

@@ -0,0 +1,29 @@
+using System.IO;
+using SixLabors.ImageSharp;
+
+namespace GifResizer.Models;
+
+public class GifData
+{
+    public GifData(string path)
+    {
+        Load(path);
+    }
+
+    private void Load(string path)
+    {
+        ArgumentNullException.ThrowIfNull(path);
+        if (path.Length == 0 || path.IsWhiteSpace() || !File.Exists(path)) 
+            throw new ArgumentException($"File '{path}' does not exist");
+        
+        using Image image = Image.Load(path);
+        Path = path;
+        Width = image.Width;
+        Height = image.Height;
+    }
+    
+    public string Path { get; private set; }
+    public int Width { get; private set; }
+    public int Height { get; private set; }
+    
+}