Implement ImageCreatorImageSharp using SixLabors.ImageSharp for image processing

- Added ImageCreatorImageSharp class for image creation, handling EXIF orientation, resizing, and saving images.
- Replaced GDI+ dependencies with ImageSharp for cross-platform compatibility.
- Introduced methods for drawing text and logos on images, including handling transparency and positioning.
- Created a test plan for validating ImageCreatorImageSharp functionality, focusing on image resizing, text positioning, logo features, and EXIF orientation.
- Added documentation for the test plan outlining goals, project structure, and implementation notes.

MaddoShared.ImageSharpTests/Helpers/TempWorkspace.cs

@@ -0,0 +1,33 @@
+using System;
+using System.IO;
+
+namespace MaddoShared.ImageSharpTests.Helpers
+{
+    public sealed class TempWorkspace : IDisposable
+    {
+        public DirectoryInfo Root { get; }
+        public DirectoryInfo SourceDir { get; }
+        public DirectoryInfo DestDir { get; }
+
+        public TempWorkspace()
+        {
+            var root = Path.Combine(Path.GetTempPath(), "MaddoShared.ImageSharpTests", Guid.NewGuid().ToString("N"));
+            Root = Directory.CreateDirectory(root);
+            SourceDir = Directory.CreateDirectory(Path.Combine(Root.FullName, "Source"));
+            DestDir = Directory.CreateDirectory(Path.Combine(Root.FullName, "Dest"));
+        }
+
+        public void Dispose()
+        {
+            try
+            {
+                if (Root.Exists)
+                    Root.Delete(true);
+            }
+            catch
+            {
+                // best-effort cleanup
+            }
+        }
+    }
+}