how to implement a style guide for a team of 2-4

I am reading Lean UX right now, and there is an idea inside I have never read before.

It is about style guide.

I would like to implement that but with as small a foot print as possible for the beginning.

I am a software developer. I usually work with a graphic designer who has no experience with HTML/CSS. He usually produces a design either in psd or ai.

How do I create a style guide that is easy for a non-tech graphic designer and myself to use for collaboration?

I want the style guide like a living documentation. Preferably it should also include some HTML/CSS code of the elements that I can easily copy paste.

Do I

  • go find a server and install a wiki?
  • use Google docs?
  • use something else?

I read this UX style guide techniques but I want something for a small team of 2-4.