README.md

The JSON file structure of data from one topic is as follows:
```json
{
  "max_scores" : [list of numbers] ,
  "attempts" : [
    {
      "id " : str,
      "records" : [list of lists of numbers],
    }
  ]
}
```
where:
• max_scores: The length of the list is the number of questions of the topic, and the value of each
element is the maximum score for a question,
• attempts: List of student attempts.
• id: Student ID
• records: The length of the outer list is the number of questions of the topic, the length of each inner
list is the number of submissions of the question, and each item in the inner list is the score of the
submission