[best practice] Creating The Project 翻訳

##  Summary

[Symfony Best Practices][201] の翻訳作業における [Creating The Project][1] 作業分です。

https://github.com/symfony-japan/symfony-docs-ja/issues/322 

[201]: http://symfony.com/doc/download-best-practices-book/
[202]: https://github.com/symfony/symfony-docs/tree/master/best_practices
[203]: https://github.com/symfony-japan/symfony-docs-ja/wiki
[1]: https://github.com/symfony/symfony-docs/blob/master/best_practices/creating-the-project.rst