Added some sounds

Added some sounds. 

All the sounds are from OpenGameArt.org

Sound authors:

* https://opengameart.org/content/creepy-forest-f

* https://opengameart.org/users/starninjas

* https://opengameart.org/users/qubodup

* https://opengameart.org/users/p0ss

* https://opengameart.org/content/applause

* https://opengameart.org/content/forest

Thank you!