[#4] infrastructure and sample Client Cut

Signed-off-by: Pavel Gross <p.gross@yadro.com>

src/FrostFS.SDK.ClientV2/RequestSigner.cs

@@ -91,7 +91,7 @@ public static class RequestSigner
         {
             IRequest => new RequestVerificationHeader(),
             IResponse => new ResponseVerificationHeader(),
-            _ => throw new InvalidOperationException("Unsopported message type")
+            _ => throw new InvalidOperationException("Unsupported message type")
         };
       
         var verifyOrigin = message.GetVerificationHeader();