scratch/xiam: add main.go file.

Change-Id: If63481354adf6f47fb4fb17ef171afc566ac8d1a
Reviewed-on: https://go-review.googlesource.com/48723
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Han-Wen Nienhuys <hanwen@google.com>
1 file changed