Add migrated to .NET 8.0 variant of Hcs.Client

Hcs.ClientNet/GostCryptography/Base/GostSignatureDescription.cs

@@ -0,0 +1,11 @@
+using System.Security.Cryptography;
+
+namespace GostCryptography.Base
+{
+    /// <summary>
+    /// Информация о свойствах цифровой подписи ГОСТ
+    /// </summary>
+    public abstract class GostSignatureDescription : SignatureDescription
+    {
+    }
+}