Add default code reviewers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: Ibf76f17d63346773322ed922bd7b5c9cc5017594
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..eb9ff18
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1 @@
+include platform/system/netd:/OWNERS