Add Google Go Style Guide

[enocom]

Thanks for the PR. It's a good suggestion. I want to keep the item you removed, so I'll update here with what we can remove instead to find room for this.

[enocom]

Why don't we remove "Tags in Golang"? I think there's probably enough on the internet about that, such that people can find it elsewhere if needed.

[pellared]

Done 😉 BTW I made a mistake. I wanted to remove Structuring Tests in Go 😆

[enocom]

Thanks for this.