Review all Data Models and restructure appropriately

[sushanthreddyu]

Documents

• ExamData
• QuestionData(MCQs)

DTOs

• ExamDataDTO
• ExamDTO
• QuestionDTO(MCQs)

Controllers

1. ExamController
   • Author's Endpoints
     • Create Exam
     • Get Exam Data with Answers by Exam ID
   • Candidate's Endpoints
     • Get all Exams
     • Get Exam Data without Answers by Exam ID

• Added Cloud MongoDB