Pull Request: C3_Saeed_164_Course_Sign_Up_2.6

Issue #164 

Please review me @Rania-Abdel-Fattah,  @ranaelnagar,  @Ahmed-Moataz, @Ahmed-Atef, @ahmed93 


For Scenario sign up for course Computer programming Lab with student 2, now the database will be updated and system recommendations will be visibe for student2