evanh: add a main.go for Gophercon

Change-Id: I14a73391c0dde0b3020ba803c855fd1eaa5cb968
Reviewed-on: https://go-review.googlesource.com/48752
Reviewed-by: Jessica Frazelle <me@jessfraz.com>
Reviewed-by: Chris Broadfoot <cbro@golang.org>
1 file changed