code: public static Validator<CharSequence> maxLength(@NonNull final CharSequence errorMessage,
                                                      final int maxLength) {
          return new MaxLengthValidator(errorMessage, maxLength);
      }
docs: Creates and returns a validator, which allows to validate texts to ensure, that they are not
  longer than a specific length.
  
  @param errorMessage
  The error message, which should be shown, if the validation fails, as an instance of
  the type {@link CharSequence}. The error message may not be null
  @param maxLength
  The maximum length a text may have as an {@link Integer} value. The maximum length
  must be at least 1
  @return The validator, which has been created, as an instance of the type {@link Validator}