Service Class, for users, and course

Made some changes to the data class
Merge branch 'master' of https://github.com/Caf131/com-virtual-app

Conflicts:

virtual-classroom/src/main/java/com/vcclass/app/Services/CourseService.j
ava

virtual-classroom/src/main/java/com/vcclass/app/Services/UserService.jav
a
Updated Classes
Merging Conflicts