clairew: add main.go for Gophercon contributor testing
clairew: add main.go for Gophercon contributor testing

Change-Id: Iefb17a4b5787a7c8fcf7e541d256b67596a48f23
Reviewed-on: https://go-review.googlesource.com/48778
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/scratch