Add go

[hkurokawa]

The code is from http://golang.org/ref/spec#An_example_package

I think the program is very goish as it takes advantage of channel. But if you want another version, say, a version without channel, please ask me.

Thanks.

[gogotanaka]

@hkurokawa thank you so much! I'm really appreciate it!!!
But I'd like to keep this ↓ good balance.

so, give me some time.