Added docs into services

buisnesslogic/src/main/java/com/plannaplan/services/CourseService.java

@@ -9,6 +9,10 @@ import com.plannaplan.repositories.CourseRepository;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
+/**
+ *  Service of CourseService which can get(Course By Name, All Courses, Courses Ammount ), save, delete course.
+ */
+
 @Service
 public class CourseService {
     @Autowired