Add chapter1 composer.json
Composer install
Codecept bootstrap
codecept generate:cept acceptance HomePage
Add .gitignore
Add check '/' to HomePage test
Change acceptance suite to read from localhost:8888

We wana run our web server on localhost:8888, so the test should read
from it as well
Add index.php & serve it by 'php -S localhost:8888'
Modify index.php to satisfy the welcome test