Add default code reviewers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: I83510383e4252ecd69d565ebca42e5ec38cbb2ad
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..86ef3ec
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,5 @@
+# Default code reviewers picked from top 3 or more developers.
+# Please update this list if you find better candidates.
+jmgao@google.com
+# used by adb
+include platform/system/core/adb:/OWNERS