What are the two methods used for data storage in an Object Store?
The two methods for storing data in an IndexedDB object store are `put()` and `add()`. Both store key-value pairs, but behave differently on key conflict.
Object stores support two methods : the put() and add() methods that store values. The put(value, [key]) adds values to the store. The object store supplies the key only if the object store does not have keyPath or autoIncrement option. If there is already a value with the same key, it gets replaced. The add(value, [key]) function is the same as the put method, except if a value with the same key already exists, the request fails, and an error with the name "ConstraintError" gets created.
