[media] Add a todo file for staging/tm6000

Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/staging/tm6000/TODO

+There a few things to do before putting this driver in production:
+	- CodingStyle;
+	- Fix audio;
+	- Fix some panic/OOPS conditions.
+
+Please send patches to linux-media@vger.kernel.org