doc: add go-tour-kr, a Korean translation of A Tour of Go
doc: add go-tour-kr, a Korean translation of A Tour of Go

R=golang-dev, dsymonds
CC=golang-dev
http://codereview.appspot.com/5273043
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go