add OWNERS file for the ThreadNetwork mainline project

Bug: 262471085
Change-Id: Idc92618dcef8df888215fa7de43653affebba890

OWNERS

diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..3536eda
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,6 @@
+# Bug component: 1203089
+
+wgtdkp@google.com
+xyk@google.com
+yuwenlan@google.com
+zhanglongxia@google.com