updater_sample: Add OWNERS.

Test: N/A
Change-Id: I519a0fa38b87c7d826ed07414d14a4f7a858aeb4
diff --git a/updater_sample/OWNERS b/updater_sample/OWNERS
new file mode 100644
index 0000000..5c1c370
--- /dev/null
+++ b/updater_sample/OWNERS
@@ -0,0 +1,2 @@
+zhaojiac@google.com
+zhomart@google.com