Update the ReadMe

Making a good ReadMe

README.md

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 # MapManga
 
-Vianney Jourdy (G9) Hersan Mathéo (G10)
+Vianney Jourdy (G9) Hersan Mathéo (G10)
+
+## Overview
+MapManga is an application designed to help manga and anime fans manage their reading and viewing experience. If you are a manga and anime fan, MapManga is the perfect application for you.
+
+## Documentation 
+All the information about MapManga are [here](https://codefirst.iut.uca.fr/git/vianney.jourdy/MapManga/src/branch/master/Documentation "Documentation").