added Mac ds_store files to repo ignore list...

git created a gitignore file to track these
Major update, new features, improved gameplay

Version 0.9.8.0
added: player health tracking
added: player health amount displayed during gameplay
added: enemy count tracking
added: remaining enemy count displayed during gameplay
added: player character is bounced back when touching an enemy
added: level restarts when player destroys all visible enemies
added: level restarts when player health reaches zero
added: health and enemy counts reset on level restart
fixed: enemies respawn on restart of level