Extend the BaseRepository to support: add

The function is for creating a new entity in the database.

The function signature should like:

add<T>(object: T>: T

So the subclass can do:

TokenRepository.add(token)

Possible edge cases:

• Unexpected property: id. (422 HTTP code with error message)
• Maybe there are some cases that database will throw error like, foreign key violation, we should translate this type of exception to : (500, database exception)

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