MAINTAINERS: add maintainer for COLO-proxy

add Zhang Chen and Li zhijian as co-maintainers of COLO-proxy.
Signed-off-by: NZhang Chen <zhangchen.fnst@cn.fujitsu.com>
Signed-off-by: NLi Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: NWen Congyang <wency@cn.fujitsu.com>
Signed-off-by: NJason Wang <jasowang@redhat.com>

MAINTAINERS

@@ -1364,6 +1364,15 @@ F: util/uuid.c
 F: include/qemu/uuid.h
 F: tests/test-uuid.c
 
+COLO Proxy
+M: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
+M: Li Zhijian <lizhijian@cn.fujitsu.com>
+S: Supported
+F: docs/colo-proxy.txt
+F: net/colo*
+F: net/filter-rewriter.c
+F: net/filter-mirror.c
+
 Usermode Emulation
 ------------------
 Overall