staging: irda: add a TODO file.

The irda code will be deleted in a future kernel release, so no need to
have anyone do any new work on it.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/staging/irda/TODO

+The irda code will be removed soon from the kernel tree as it is old and
+obsolete and broken.
+
+Don't worry about fixing up anything here, it's not needed.