If you want to start a new kata, for example 'Supermarket Kata'
Then use a 'create-project' command of composer for clonate this template
php composer.phar create-project aperezg/php-skeleton-kata your/app-directory/supermarket-kata dev-master
Add your classes into 'src/Kata' and your test cases on 'src/Kata/Tests' and run your tests:
php bin/phpunit
Enjoy the Kata!