crda: add URLs to README

Cc: Luis R. Rodriguez <mcgrof@kernel.org>
Cc: WIRELESS ML <linux-wireless@vger.kernel.org>
Cc: REGDB ML <wireless-regdb@lists.infradead.org>
Signed-off-by: Xose Vazquez Perez <xose.vazquez@gmail.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
1 file changed