A tutorial teaching the basics about multimedia with the arsd library

[Murilo]

> I really dislike that you use screenshots of code, it makes 
> copy-pasting impossible. There are ways to produce pdfs with 
> colored, copyable source code (like using RST for redaction 
> then rst2pdf for production, but I'm not sure it'll be the 
> easiest for you).

I will change that now. Thanks for the advice, it did not occur 
to me that copy-pasting was important because I always prefer 
typing the whole code in order to practice and learn better.