Update README.md

README.md

 # EditPdfPlus : fork of Moodle/editpdf, with customs options
 Welcome to EditPdfPlus: fork of Moodle/editpdf module, developped by UNIL/RISET
 
-# Screenshots
+## Screenshots
 //TODO
 
-# Easy start
-## Install a release
+## Easy start
+### Install a release
 //TODO
 
-## Configuration
+### Configuration
 //TODO
 
-## Active and use EditPdfPlus
+### Active and use EditPdfPlus
 //TODO
 
-# Authors
+## Authors
 RISET @ UNIL
 
 EditPdfPlus is a free software released under GPL3 licence.
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