Architecture.md

+Plugin source code is in folder `PreCourlis`.
+
+## Main modules and Classes :
+
 ### PreCourlisPlugin class
 
 Acts as the central component that manages the functionality of the PreCourlis plugin within the QGIS environment, providing a bridge between the plugin's features and the QGIS platform.
 
 It is responsible for loading custom algorithms provider, creating toolbars and calling dialog.
 
-## PreCourlis.core module
+### PreCourlis.core module
 
 This module contains classes which do not depend on graphical interface.
 
@@ -18,7 +22,7 @@ The `PointsSelection` class is responsible for creating and maintaining a memory
 The `Settings` class is responsible for reading and writing plugin settings in the QGIS project file and user settings.
 
 
-## PreCourlis.lib.mascaret
+### PreCourlis.lib.mascaret
 
 Those two files comes from the Mascaret project and have been slightly adapted to be used inside the plugin. 
 
@@ -29,17 +33,17 @@ They contain notably:
 - `MascaretGeoFile` class which is used to read and write .geo and .georef files.
 
 
-## PreCourlis.processing module
+### PreCourlis.processing module
 
 This module contains all the custom algorithms for processing data.
 
 
-## PreCourlis.ui
+### PreCourlis.ui
 
 This folder contains the Qt Designer (user interface) files of the plugin.
 
 
-## PreCourlis.widgets module
+### PreCourlis.widgets module
 
 These widgets are used to manage the user interface of the PreCourlis plugin within the QGIS environment. They provide a way for users to interact with the plugin's functionality and modify its settings.