Add default code reviewers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: I87450ec7dec211e4ee5122fbf18357269a65cbae
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..bf3ce34
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,4 @@
+# Default code reviewers picked from top 3 or more developers.
+# Please update this list if you find better candidates.
+jsharkey@android.com
+felkachang@google.com