Added legacy jQuery documentation for tmpl() to README.md

I ran http://web.archive.org/web/20121014080309/http://api.jquery.com/jquery.tmpl/ through http://heckyesmarkdown.com/ to extract a workable copy of the documentation in a format ready for a GitHub readme.

There was a few issues with snippets that reffered to URLs and ids, but it wasn't too hard to clean up and format. I grabbed everything but the demos, but others are welcome to make it how they like it.