Add autoloader script when not insatlling via composer

[henrydatei]

When using this repo without installing it via composer it is not enough to just download all files. You also have to include then manually. Thankfully someone on Stackoverflow (https://stackoverflow.com/a/6962046) has written an autoloader to automatically include all files. Since it worked for me flawlessly I think mentioning this is a good idea.

[Devocub]

Thanks, helped, but you need to mention to put folder "gburtini" from "Probability-Distributions-for-PHP-master\src" near file where you use this code from example. Shame to author you can't just use require_once("Probability-Distributions-for-PHP-master\src\gburtini\entryfile.php"); Spent 40 minutes trying to connect files just to calculate some useless numbers