updated README.md with doc instructions

README.md

@@ -36,6 +36,10 @@ The app will open in your default browser.
 ## Usage
 The web app allows you to process sample selection, model creation and predictions.
 
+## Documentation
+The doc is generated with mkDoc and Python DocStrings.
+From CLI, run 
+> mkdocs serve
 ## Authors and acknowledgment
 Contributors:
 - Nicolas Barthes (CNRS)