Copyright added.

app/src/main/java/com/nextcloud/client/account/UserAccountManagerImpl.java

@@ -2,7 +2,9 @@
  * Nextcloud Android client application
  *
  * @author Chris Narkiewicz
+ * @author TSI-mc
  * Copyright (C) 2019 Chris Narkiewicz
+ * Copyright (C) 2023 TSI-mc
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE