Добавлены репозитории

src/main/java/ru/IP_LabWorks/IP/University/Repository/GroupRepository.java

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+package ru.IP_LabWorks.IP.University.Repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import ru.IP_LabWorks.IP.University.Model.Group;
+
+public interface GroupRepository extends JpaRepository<Group, Long> {
+}

src/main/java/ru/IP_LabWorks/IP/University/Repository/StudentRepository.java

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+package ru.IP_LabWorks.IP.University.Repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import ru.IP_LabWorks.IP.University.Model.Student;
+
+public interface StudentRepository extends JpaRepository<Student, Long> {
+}

src/main/java/ru/IP_LabWorks/IP/University/Repository/SubjectRepository.java

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+package ru.IP_LabWorks.IP.University.Repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import ru.IP_LabWorks.IP.University.Model.Subject;
+
+public interface SubjectRepository extends JpaRepository<Subject, Long> {
+}