Add easy recompression to readme

README.md

@@ -43,11 +43,21 @@ This project provides multiple NuGet packages:
 
 ## Usage
 
-Example usage for `MozJpegSharp.GdiPlus`:
+Recompression using just `MozJpegSharp`:
 
 ```csharp
 var inFile = "in.jpg";
 var outFile = "out.jpg";
+var inBytes = await File.ReadAllBytesAsync(inFile);
+var compressed = MozJpeg.Recompress(inBytes.AsSpan(), quality: 80);
+await File.WriteAllBytesAsync(outFile, compressed);
+```
+
+Example usage for `MozJpegSharp.GdiPlus`:
+
+```csharp
+var inFile = "in.jpg"; // does not need to be jpg
+var outFile = "out.jpg";
 using var bmp = new Bitmap(file);
 using var tjc = new MozJpegSharp.TJCompressor();
 var compressed = tjc.Compress(bmp, MozJpegSharp.TJSubsamplingOption.Chrominance420, 75, MozJpegSharp.TJFlags.None);