public Favourite AddFavourite(Favourite favourite)
{
var favouriteAvailibilityStatus = favouriteRepository.GetFavouriteByTitle(favourite);
if (favouriteAvailibilityStatus.Count==0)
{
return favouriteRepository.AddFavourite(favourite);
}
else
{
throw new FavouriteAlreadyExistsException("Favorite already exists");
}
}