StudentConsoleApp1

                                                     UML Diagram of Proposed Classes:
                                                     
                                                     
                                                                Student
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                                      + StudentName                                         string
                                      + StudentGrade                                          char
                                      + Student Group                                          int
                                      - secretNickname                                      string
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                                      + void              DisplaySecretNicknameFromWithinStudentClass()
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                                                                 School
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                                      + void                                  UpgradeStudentGrade()
                                      + void                                DowngradeStudentGrade()
                                      + void                              GetSchoolStudentDetails()
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                                       Class School instantiates an object of public class Student.