git clone https://github.com/den-v/test-task.git
cd test-task
php composer.phar global require "fxp/composer-asset-plugin:~1.0.0"
php composer.phar update

Now you should be able to access the application through the following URL, assuming basic is the directory directly under the Web root.

http://localhost/basic/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',
];

NOTE: Yii won't create the database for you, this has to be done manually before you can access it.

Also check and edit the other files in the config/ directory to customize your application.

yii migrate