Create generatePaper API

[aswinshenoy]

Requires fixing #12,
The generatePaper API accepts question paper contstrains from the user, generates a question paper and returns it.

(Proposed) Parameters/Constraints

• marks
• difficulty
• clubQuestions - Boolean
• optionalQuestions - Boolean
• savePreset - Boolean
• topics: ObjectArray{
  topics: (Relational to topic model, its slug should be accepted),
  min_marks: int,
  max_marks: int,
  optional: boolean (default false)
  }
• types: ObjectArray{
  types: (Relational to type model, its slug should be accepted),
  min_marks: int,
  max_marks: int
  } [ Optional ]
• sections: ObjArray{
  title: string,
  marks: int
  types: (Relational to type model, its slug should be accepted),
  topics: (Relational to topic model, its slug should be accepted),
  difficulty:[enum]
  }

(Proposed) Return

-> Return QuestionPaper Obj ID [ which can be queried using another API to get the question paper in required form].

[aswinshenoy]

The logic of question paper generation can be implemented separately, essentially this issue is only to handle the API and send required params to the generator script (assuming one exists).

[nipan09]

@aswinshenoy, I am trying to add relation for types and sections parameters and also enum type for difficulty constraint under sections parameters, but I cannot able to put it in schema file. How should I approach?