Add default code reviewers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: I8b78cbf9f040f3b16cb486d5788f325c38ae41e6
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..fe9f33f
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,3 @@
+# This project has no significant updates recently.
+# Please update this list if you find better candidates.
+rtenneti@google.com