document FritzBox setup

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+= Client Setup =
+
+== FritzBox ==
+
+In the DynDNS configuration section of the FritzBox, choose the "custom"
+DynDNS provider. The enter the following settings:
+
+Update-URL: https://ns.ralfj.de/update?domain=<domain>&password=<pass>&ip=<ipaddr>
+Domainname: domain.dyn.ralfj.de
+Benutzername: TotallyDoesNotMatter
+Kennwort: YourPassword