refactor: add logging category for credentials

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

libraries/katabasis/include/katabasis/DeviceFlow.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <QLoggingCategory>
 #include <QNetworkAccessManager>
 #include <QNetworkRequest>
 #include <QNetworkReply>
@@ -11,6 +12,8 @@
 
 namespace Katabasis {
 
+Q_DECLARE_LOGGING_CATEGORY(katabasisCredentials)
+
 class ReplyServer;
 class PollServer;