Update README.md

README.md

@@ -38,8 +38,14 @@ This is the directory structure
 
 # How to use it
 ## Workflow
-First of all, check if a docker image already exist.
-If exist, pull it, otherwise you neeed to build one.
+First of all, check if a docker image already exists.
+If it exist, pull, otherwise, you need to build one.
+If necessary create a [personal token](https://gitlab.scientificnet.org/profile/personal_access_tokens) and login into GitLab Registry.
+
+```console
+docker login gitlab.scientificnet.org:4567
+```
+ 
 ### Use existing Docker image
 ```console
 docker image ls -a gitlab.scientificnet.org:4567/commul/dspace/*