add runtime-spec maintainers and mashimiao

Signed-off-by: liang chenye <liangchenye@huawei.com>

MAINTAINERS

@@ -1,2 +1,11 @@
+Michael Crosby <michael@docker.com> (@crosbymichael)
+Alexander Morozov <lk4d4@docker.com> (@LK4D4)
+Vishnu Kannan <vishnuk@google.com> (@vishh)
 Mrunal Patel <mpatel@redhat.com> (@mrunalp)
+Vincent Batts <vbatts@redhat.com> (@vbatts)
+Daniel, Dao Quang Minh <dqminh89@gmail.com> (@dqminh)
+Brandon Philips <brandon.philips@coreos.com> (@philips)
+Tianon Gravi <admwiggin@gmail.com> (@tianon)
+Qiang Huang <h.huangqiang@huawei.com> (@hqhq)
 Liang Chenye <liangchenye@huawei.com> (@liangchenye)
+Ma Shimiao <mashimiao.fnst@cn.fujitsu.com> (@Mashimiao)