Added new feature; user can pick up items found at various locations, can drop picked up items, and can kill the dragon.
Modified the Location class constructor; added two properties, namely; location name, and ArrayList<Item> of items. The location name property is a short name (compared to description of location) which is used to check the name of the player's current location. This is particularly useful to determine if the user is in the Dragon's Cave before they use the kill command.