docs: add main introduction

README.md

@@ -1,7 +1,12 @@
-# EDT with API for the IUT Informatique of Limoges
+# EDT for the IUT Informatique of Limoges
 
-> A random as hell project, once again...
+Contains a very simple [NPM package for Node.js](https://www.npmjs.com/package/edt-iut-info-limoges) that allows you to get and parse the timetable of the IUT Informatique of Limoges in a very simple and intuitive way.
 
-## API from the website
+A demonstration website has been made to showcase the package: *TODO*, you can find the source code for it in the section below.
 
-In development...
+## Sources
+
+Since this is a monorepo, the sources are located in the `packages` directory.
+
+- [`packages/library`](./packages/library/): the [`edt-iut-info-limoges`](https://www.npmjs.com/package/edt-iut-info-limoges) library itself ;
+- [`packages/website`](./packages/website/): the website for the demo of the library.