Add OWNERS to Launcher3/go

The code in this directory only impacts the Go Launcher variants, so it would make sense for the owners to be from the Go team.

Bug: 183627385
Test: N/A
Change-Id: Iab09be2d590d25bce6de07048befa2e832a54623
diff --git a/go/OWNERS b/go/OWNERS
new file mode 100644
index 0000000..903b3c4
--- /dev/null
+++ b/go/OWNERS
@@ -0,0 +1,2 @@
+rajekumar@google.com
+spivack@google.com