Create README.md

README.md

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+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