Adds (assigns) a permission to those directly associated with the account. If the account doesn't yet have any
direct permissions, a new permission collection (a Set<string>) will be created automatically.
@param permission the permission to add to those directly assigned to the account.
Adds (assigns) a permission to those directly associated with the account. If the account doesn't yet have any direct permissions, a new permission collection (a Set<string>) will be created automatically. @param permission the permission to add to those directly assigned to the account.