Add .gitignore to php-worker (#1780)

* Add .gitignore
* Change file to example.

php-worker/supervisord.d/laravel-worker.conf.example

@@ -0,0 +1,7 @@
+[program:laravel-worker]
+process_name=%(program_name)s_%(process_num)02d
+command=php /var/www/artisan queue:work --sleep=3 --tries=3 --daemon
+autostart=true
+autorestart=true
+numprocs=8
+redirect_stderr=true