joshroppo: adding main.go for Gophercon
joshroppo: adding main.go for Gophercon

Change-Id: Id75887af70b4d8455c93ea5eba5d5efcf35ade0a
Reviewed-on: https://go-review.googlesource.com/48897
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/scratch