Staging: serqt_usb: add TODO file

Adds a TODO file
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/serqt_usb/TODO

+Things to do for this driver to get merged into the main portion of the
+kernel:
+	- checkpatch cleanups
+	- sparse clean
+	- port to the usb-serial layer instead of doing it all on its
+	  own.
+
+Send patches to Greg Kroah-Hartman <greg@kroah.com>