import yii_sinoptik_junior.sqlcomposer installphp -S localhost:8000 -t web
Edit the file config/db.php with real data, for example:
return [
'class' => 'yii\db\Connection',
'dsn' => 'mysql:host=localhost;dbname=yii2basic',
'username' => 'root',
'password' => '1234',
'charset' => 'utf8',
];