Include composer.lock after a `composer update`

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Create RogerioPradoJ\TutoBehatNettuts\Phpadder.php

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Create phpadder.feature

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Create features/bootstrap/FeatureContext.php with first step, @Given

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>