Add default code reviewers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: I9632d6dea90a6feac952c65bc5d34b1cb6b4756d
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..d691900
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,2 @@
+# used by the Dialer app
+include platform/packages/apps/Dialer:/OWNERS