Link the introduction to the repo

[tiye]

I know shotgun by reading that blog:
http://codetunnel.com/blog/post/build-custom-shells-with-node-shotgun
but finding the repo back took me a long time since it's not on top of Google.
Also I suppose this post should be linked in the repo too, so others may know this.

[chevcast]

I did include a link to the wiki attached to this repo but I suppose a link to the repo itself is probably a good idea even though the blog post is already outdated. I'll add one in the note at the top.