Update dump infos

Readme.md

-**This repo should remain private**
-
 ## Setting up your environement
 
 1. Clone this repository
@@ -25,7 +23,9 @@ touch dolibarr/documents/install.lock
 
 ## Databases (For developpement)
 
-There is a `dumps/` directory in this repository holding dumps from dev the instances of Dolibarr we use
+There is a `dumps/` directory in this repository holding a very old dump from a dev instance of Dolibarr 9.x
+
+admin password on this instance is `dev`
 
 [There is a dump](dumps/internal.sql.gz) from a database used for internal developpements. You can import it by running:
 ```bash