gk: add main.go for Gophercon

Change-Id: I2d4f87a2a96afcc766bf272e83aa10eb8ae96c33
Reviewed-on: https://go-review.googlesource.com/48770
Reviewed-by: huadcu sulivan <huadcu@gmail.com>
Reviewed-by: Chris Broadfoot <cbro@golang.org>
1 file changed