btracey: add main.go for Gophercon and say hello to Brad
btracey: add main.go for Gophercon and say hello to Brad

Change-Id: I88a73f0e14b5fce868dd7e5f2bb8afcb2fbd76ef
Reviewed-on: https://go-review.googlesource.com/48904
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/scratch