Merge pull request #42 from yochem/master

Rename folders to be in order // added useful links to README

Author: dragonwasrobot

README.md

@@ -2,8 +2,8 @@
 
 ## What is this?
 This repository contains my solutions to the exercises found in the
-'Learn Prolog Now!' book by Patrick Blackburn, Johan Bos and Kristina
+'Learn Prolog Now!' [book](http://www.learnprolognow.org) by Patrick Blackburn, Johan Bos and Kristina
 Striegnitz.
 
 Be aware that the provided solutions may contain errors, in which case
-you are more than welcome to submit a PR with any corrections.
+you are more than welcome to [submit a PR](https://github.com/dragonwasrobot/learn-prolog-now-exercises/pulls) with any corrections.