Add a brief explanation of repository contents.

Author: GIobal

README.md

@@ -1,2 +1,9 @@
 # Python-Programming-Course
-Hogeschool Utrecht first year programming course Python exercises.
+This repository contains the Python exercises I had to do in my first year
+at Hogeschool Utrecht for a Programming Course. The book we used for this
+course is **Introduction to Computing Using Python** by **Ljubomir Perkovic**.
+
+The repository is divided into lessons by number, with each lesson containing
+a file per practice exercise. File names are written using `pe(rkovic)_chapter.subchapter.py` format.
+
+Beware that all comments are written in Dutch.