AddSourceViewModel

.swift

 override func viewDidLoad() {
        super.viewDidLoad()

        self.addSourceViewModel = AddSourceViewModel()

        self.descriptionTextView.bind { count,limit in
         
            self.remainingCharactersCountLabel.text = "\(self.addSourceViewModel.remainingNumberOfAllowedCharacters(numberOfCharactersEntered: count, limit:limit))"
        }.limit(to: Maximum.allowedCharactersForDescription)
    }