Add default code reviewers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: I65375fa3d3c4de99a072ec759f3fdb379fabe4c6
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..89eea21
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,7 @@
+# Default code reviewers picked from top 3 or more developers.
+# Please update this list if you find better candidates.
+chrisforbes@google.com
+cnorthrop@google.com
+courtneygo@google.com
+ianelliott@google.com
+tobine@google.com