DTO: ModuleAssignmentDetailsDTO

Look into #75 (closed) for details about how this will be used.

DTO

Name: ModuleAssignmentDetailsDTO

This DTO is a:

• Create
• Patch
• View

It has the following fields:

Type	Name	Comment
ModuleSummaryDTO	super	extends this
StudentGroupSummaryDTO	group	see in #72 (closed)
Grade	grade	not sure what's the current datatype of grade, for now any number is fine, this is supposed to be the final grade from that module; also I'm not sure if that's a core thing
List<AssignmentSummaryDTO>	assignments	I don't need the description or deadline here, so it might be moved away from AssignmentSummaryDTO

used in #74 (closed)