Merge branch 'daxid-main-patch-90226' into 'main'

Mettre à jour README.md

See merge request iiif/POC-mirador!12

README.md

@@ -19,6 +19,10 @@ This readme assumes that you now a few basic about `docker` and `docker-compose`
 
 ### Install
 
+Clone the current git repository and cd inside.
+
+Run `submodule init && submodule update`  *NOTE : this step might not be necessary at some point*
+
 Copy `.env.template` to `.env` and change variables to suit your need.
 
 You **MUST** set at least the `ANNOTOT_SECRET_KEY_BASE` to a random string, the rest is preconfigured for a local development environment.