PumpkinSeed: add my very own main.go
PumpkinSeed: add my very own main.go

Change-Id: Icdb70013a273850ea771ccb84e0b4eb0fb956b54
Reviewed-on: https://go-review.googlesource.com/c/144165
Reviewed-by: Daniel Martí <29bf28b42a938ace12a5819da4ed4ba03d82f315@mvdan.cc>
Run-TryBot: Daniel Martí <29bf28b42a938ace12a5819da4ed4ba03d82f315@mvdan.cc>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

golang/scratch