Merge branch 'task-implementation-student' into 'master'

...ui/cs/advprog/tutorial0/controller/StudentController.java

...og/tutorial0/exception/DuplicateStudentnameException.java

...ain/java/id/ac/ui/cs/advprog/tutorial0/model/Student.java

...ui/cs/advprog/tutorial0/repository/StudentRepository.java

...id/ac/ui/cs/advprog/tutorial0/service/StudentService.java

...c/ui/cs/advprog/tutorial0/service/StudentServiceImp1.java

src/main/resources/templates/createStudent.html

src/main/resources/templates/studentList.html