Add default active developers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: Ia736bdb68b3b5efb52a4efe8c1b4b052fa9a142a
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..4d9907d
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1 @@
+yim@google.com