You can install Vista via Composer. Run the following command in your terminal: 
composer require nullaidev/vista

Composer

Access on packagist.org

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Entry Point

Now, create a View and render it from your project main entry point, such as a typical public/index.php: 
require_once __DIR__ . '/../vendor/autoload.php';
const NULLAI_VISTA_VIEWS_FOLDER = __DIR__ . '/views';

echo new \Nullai\Vista\View('home');
For each page you can provide a new view.