USB: cxacru: add Documentation file

The sysfs attributes for exposing cxacru statistics/status information with
possible values is now explained in Documentation/networking/cxacru.txt
including information on the writable adsl_state attribute's commands and a
sample of the kernel log format.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Cc: Duncan Sands <duncan.sands@math.u-psud.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/Documentation/networking/00-INDEX b/Documentation/networking/00-INDEX
index e06b6e3..153d84d 100644
--- a/Documentation/networking/00-INDEX
+++ b/Documentation/networking/00-INDEX
@@ -32,6 +32,8 @@
 	- info on the COPS LocalTalk Linux driver
 cs89x0.txt
 	- the Crystal LAN (CS8900/20-based) Ethernet ISA adapter driver
+cxacru.txt
+	- Conexant AccessRunner USB ADSL Modem
 de4x5.txt
 	- the Digital EtherWORKS DE4?? and DE5?? PCI Ethernet driver
 decnet.txt