Add default code reviewers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: Ia9744b00b73e5d48f65e77c21f8dad33bc8e20cd
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..41f55eb
--- /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.
+danalbert@google.com
+pirama@google.com
+cferris@google.com