added service function defs

src/main/java/com/StudentServices/MarksService/repository/StudentRepository.java

@@ -4,6 +4,9 @@ import com.StudentServices.MarksService.model.Student;
 import org.springframework.data.mongodb.repository.MongoRepository;
 import org.springframework.stereotype.Repository;
 
+import java.util.List;
+
 @Repository
 public interface StudentRepository extends MongoRepository <Student, String> {
+
 }

src/main/java/com/StudentServices/MarksService/service/StudentService.java

 package com.StudentServices.MarksService.service;
 
 
+import com.StudentServices.MarksService.model.Student;
 import com.StudentServices.MarksService.repository.StudentRepository;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
+import java.util.List;
+
 @Service
 public class StudentService {
 
     @Autowired StudentRepository studentRepository;
 
+    public List<Student> findAllStudents() {
+        return null;
+    }
+
+    public void addStudent(Student student) {
+    }
+
+    public Student getStudentById(String ID) {
+        return null;
+    }
+
+    public void updateStudent(Student student) {
+
+    }
+
+    public void deleteStudent(Student Student) {
+
+    }
+
+
 }