add dialog functions

Hello,

this PR add 3 functions :
- ask
- askConfirmation
- askHiddenResponse

exemple :

```
<?php
require __DIR__ . '/../vendor/autoload.php';
deployer();


task('test', 'test', function() {

    $user = ask('Username ?', 'admin');
    writeln($user);

    $password = askHiddenResponse('Password ?');
    writeln($password);

    if(askConfirmation('Confirm ?')) {
        writeln('ok');
    } else {
        writeln('ko');
    }

});

start();
```