refactor(SignDocBehavior): add to handle the events after document status updateted

EnvelopeGenerator.Application/Behaviors/SignDocBehavior.cs

@@ -0,0 +1,12 @@
+using EnvelopeGenerator.Application.DocStatus.Commands;
+using MediatR;
+
+namespace EnvelopeGenerator.Application.Behaviors;
+
+public class SignDocBehavior : IPipelineBehavior<SaveDocStatusCommand, int?>
+{
+    public Task<int?> Handle(SaveDocStatusCommand request, RequestHandlerDelegate<int?> next, CancellationToken cancellationToken)
+    {
+        throw new NotImplementedException();
+    }
+}

EnvelopeGenerator.Web/Controllers/EnvelopeController.cs

@@ -2,7 +2,6 @@
 using EnvelopeGenerator.Web.Services;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
-using System.Text.Encodings.Web;
 using EnvelopeGenerator.Application.Extensions;
 using EnvelopeGenerator.Application.Interfaces.Services;
 using EnvelopeGenerator.Domain.Constants;