Calculate a new date by adding a specified number of days to a given date. Handle both positive and negative day values.
Examples:
Input: startDate = 2023-01-15, daysToAdd = 5
Output: 2023-01-20
Explanation: Adding 5 days to January 15, 2023 results in January 20, 2023
Input: startDate = 2023-01-15, daysToAdd = -5
Output: 2023-01-10
Explanation: Subtracting 5 days from January 15, 2023 results in January 10, 2023
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