Add default code reviewers in libs/ui

Bug: None
Test: uploader
Change-Id: Iac1ee7fc42f2afd10b7219256da66ef2c2a88222
diff --git a/libs/ui/OWNERS b/libs/ui/OWNERS
new file mode 100644
index 0000000..3938e4f
--- /dev/null
+++ b/libs/ui/OWNERS
@@ -0,0 +1,5 @@
+jiyong@google.com
+mathias@google.com
+olv@google.com
+romainguy@google.com
+stoza@google.com