chore: add tips section to README

[schaeferka]

Tips

• Having trouble staying alive in the game? Use the --wizard flag when starting the game from a terminal to enable wizard mode (makes you invincible and gives you starting items that make the game easier to play):

  ./brogue --wizard

• Can't stand certain types of monsters? Adjust the Pepr Dungeon Master module to prevent them from being deployed in the cluster and delete them from the game. The initial configuration of the Pepr Dungeon Master module is in the pepr-dungeon-master directory of this repository.

• See a monster in the game that you really don't want to fight? Delete the corresponding deployment in the cluster to kill the monster in the game. For example, to delete the "kobold-8" monster deployment, run the following command:

  kubectl delete deployment kobold-8 -n pepr-dungeon-crawl