add SaveBurnedPdfBehavior to services

EnvelopeGenerator.Application/Common/Behaviors/SaveBurnedPdfBehavior.cs

@@ -1,5 +1,6 @@
 using EnvelopeGenerator.Application.Pdf;
 using MediatR;
+using Org.BouncyCastle.Utilities;
 
 namespace EnvelopeGenerator.Application.Common.Behaviors;
 
@@ -15,10 +16,10 @@ public class SaveBurnedPdfBehavior : IPipelineBehavior<BurnPdfCommand, byte[]>
     /// <param name="next"></param>
     /// <param name="cancel"></param>
     /// <returns></returns>
-    /// <exception cref="NotImplementedException"></exception>
     public async Task<byte[]> Handle(BurnPdfCommand request, RequestHandlerDelegate<byte[]> next, CancellationToken cancel)
     {
         var docResult = await next(cancel);
+        var base64 = Convert.ToBase64String(docResult);
         return docResult;
     }
 }