Added a function to pick up an item
Added a function to pick up an item

It is a method of allRooms and can be used to pick up an item.
How it works:
1. Try to assign the popped value of an item in the current room to a value in the inventory.
2. If the exception NameError is raised, notify the player.
ckjbgames/textventure,ckjbgames/textventure