Add Standard-Dialect-5-Minutes md version

[asis]

A markdown version of the "Standard Dialect in 5 Minutes" article. The translation process goes like this:

1. Clean the HTML layout stuff
2. Remove spurious white spaces
3. Replace some HTML tags
   1. kbd -> code
   2. script (src syntax highlighting stuff) -> pre
4. Escape pre tags HTML content
5. Transform the HTML into MD using pandoc
6. Tag each code block in the MD source with the right language

Given step 6 is a manual process, I can't automate the whole thing, so translating the rest of the articles will take some time :)

@ultraq, could you please take a look at the markdown source and tell me if you see any problem? Thx!

[ultraq]

Looks good. I checked out your branch and even ran the doc-generating process over the file, it created a nice HTML file. The only issue was the link at the end which is relative instead of absolute, but it was that way with the original article - if the docs get generated to a different place, then those links will need to be updated.