init the handler of ReadEnvelopeReceiverQuery

EnvelopeGenerator.Application/EnvelopeReceivers/Queries/ReadEnvelopeReceiverQueryHandler.cs

@@ -0,0 +1,22 @@
+using EnvelopeGenerator.Application.Dto.EnvelopeReceiver;
+using MediatR;
+
+namespace EnvelopeGenerator.Application.EnvelopeReceivers.Queries;
+
+/// <summary>
+/// 
+/// </summary>
+public class ReadEnvelopeReceiverQueryHandler : IRequestHandler<ReadEnvelopeReceiverQuery, EnvelopeReceiverDto>
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="request"></param>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    /// <exception cref="NotImplementedException"></exception>
+    public Task<EnvelopeReceiverDto> Handle(ReadEnvelopeReceiverQuery request, CancellationToken cancellationToken)
+    {
+        throw new NotImplementedException();
+    }
+}