docs: add spice-port-fqdn.txt

Start a simple org.qemu.* registry of well known name.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/docs/spice-port-fqdn.txt b/docs/spice-port-fqdn.txt
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+A Spice port channel is an arbitrary communication between the Spice
+server host side and the client side.
+
+Thanks to the associated reverse fully qualified domain name (fqdn),
+a Spice client can handle the various ports appropriately.
+
+The following fqdn names are reserved by the QEMU project:
+
+org.qemu.monitor.hmp.0
+  QEMU human monitor
+
+org.qemu.monitor.qmp.0:
+  QEMU control monitor
+
+org.qemu.console.serial.0
+  QEMU virtual serial port
+
+org.qemu.console.debug.0
+  QEMU debug console