Create articles: HTML Preprocessors

This will include articles about the following pre-processors:

• Haml
• Jade/Pug (@atjonathan)
• Markdown (@atjonathan)
• Slim

I'm also going to create a main file to links these all together.
 

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[akarshHegde]

Hey @atjonathan i would like to work on this. Could you refer me some existing article to get an idea how the article should be framed ?

[Rafase282]

@akarshHegde I think it would be something like this.

@akarshHegde Update on this? If you are working on an article, which one?