ieee802154: add documentation about our stack

Add MAINTAINERS entry and a small text describing our stack interfaces,
how to hook the drivers, etc.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Sergey Lapin <slapin@ossfans.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/MAINTAINERS b/MAINTAINERS
index 2f6a8fc..a6df68f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2819,6 +2819,18 @@
 S:	Maintained
 F:	drivers/ieee1394/raw1394*
 
+IEEE 802.15.4 SUBSYSTEM
+P:	Dmitry Eremin-Solenikov
+M:	dbaryshkov@gmail.com
+P:	Sergey Lapin
+M:	slapin@ossfans.org
+L:	linux-zigbee-devel@lists.sourceforge.net
+W:	http://apps.sourceforge.net/trac/linux-zigbee
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/lumag/lowpan.git
+S:	Maintained
+F:	net/ieee802154/
+F:	drivers/ieee801254/
+
 INTEGRITY MEASUREMENT ARCHITECTURE (IMA)
 P:	Mimi Zohar
 M:	zohar@us.ibm.com