Add main contributers to OWNERS

Bug: N/A
Test: N/A
Change-Id: I2c8f904def633e86d561a6d3c5a5c34fd44dad6c
diff --git a/packages/OWNERS b/packages/OWNERS
index bbc4cef..3b9fd2b 100644
--- a/packages/OWNERS
+++ b/packages/OWNERS
@@ -1,6 +1,9 @@
 akersten@google.com
 dwkang@google.com
+hdmoon@google.com
+insun@google.com
 jaewan@google.com
+jinpark@google.com
 marcone@google.com
 sungsoo@google.com
 wjia@google.com