English translation of existing comments(and variables) and add some more within:
	- lib/boostrap.php
	- lib/DbConnection.php
	- app/controllers/Controller.php
	- app/controllers/ControllerInterface.php
	- app/models/Model.php
	- app/models/Company.php

Minor indentation changes in lib/Router.php

Files and Class Names(when required) renamed:
	- ConnexionBdd.php > DbConnection.php
	- Entreprise.php 		> Company.php
	- acceuil.php		   > welcome.php
	- listeEntreprises > companiesList.php

Add Tree view in README.md