This function creates a new school gradingPeriods.
createGradingPeriod(title, start, end)
| title | The grading period title. This title must be unique across all grading periods in the school. |
|---|---|
| start | The grading period start date YYYY-MM-DD |
| end | The grading period end date YYYY-MM-DD |
A dataframe of details for the newly created gradingPeriod.