@Override
    public String getDefaultLabel() {
        return LocaleUtils.getLocalizedString("commands.admin.user.adduser.label");
    }
Adds a user to Openfire if the provider is not read-only.

@author Alexander Wenckus
@see <a href="https://xmpp.org/extensions/xep-0133.html#add-user">XEP-0133 Service Administration: Add User</a>
xmppserver/src/main/java/org/jivesoftware/openfire/commands/admin/user/AddUser.java