Dmitri Shuralyov article about Go Package Store.

Here it is, finally. Sorry it's quite literally 3 days away before the publishing date, I tend to [procrastinate](https://github.com/shurcooL?tab=activity) when I have to write English instead of Go. :P

I am planning to review and make improvements/changes tomorrow (err, Monday), and any feedback/criticism is appreciated. I won't be offended.