Paper status "Accept with Shepherd". What does it really mean?
Your paper will be shepherded. The conference organizers will assign a contact person called shepherd to your paper, who guides you through a sequence of revisions (for further information, see the question mentioned by @darijgrinberg, and this question).

The "accept with..." decision signals you that they really want your paper at the workshop, stronger than in the case of a major revision. But similar to a minor revision, there's still a possibility that your paper will be rejected, if you don't work cooperatively with the shepherd.