If you want to start a new kata:
Then use a 'create-project' command of composer for clonate this template
php composer.phar create-project monxu-rp/php-kata your/app-directory/say-hello-kata dev-master
Add your classes into 'src/Kata' and your test cases on 'tests' and run your tests:
php bin/phpunit
Run test with coverage:
bin/phpunit --coverage-html testsCoverage
Enjoy the Kata!