Add migration info

Author: allard-mx

README.md

@@ -5,6 +5,7 @@ The Administration module contains administration functionalities to manage loca
 Steps to set-up when using Mendix SSO:
 - Make sure to either exclude or delete the microflows in the 'MOVE_THIS' folder in the MendixSSO module.
 - Configure the MendixSSO_AfterStartup microflow from this module (Marketplace modules > Administration > Mendix SSO) as the After startup microflow. If there is already an After startup microflow, you should not replace it, but add the MendixSSO_AfterStartup microflow as an action in the existing microflow.
+- If you previously used the Mendix SSO in your application, use the 'MendixSSO_MigrateUsersToAccount' microflow to migrate users from the MendixSSOUser to the Administration.Account specialization (if not, you do not need to run this migration microflow). 
 
 Steps to set-up without using Mendix SSO:
 - Delete or exclude the microflows in the 'Mendix SSO' folder (Marketplace modules > Administration > Mendix SSO) if you do not want to make use of Mendix SSO.