Positive Event: Add an apple item that gives the player a speed boost. #3

One of our positive events will add an apple object, that will be scattered around the map and increase the player's speed for a short period of time once it is collected.

This should be collected only when the player presses E.

Checklist items for apple event:

• Create an apple sprite.
• Create a new interface for interact-able objects.
• Create a new interface for player effects (immunity, hurt, slowed down/speed boosted e.t.c.)
• Create and complete new class for apple objects, with all the required functionality.
  • Consume apple when interacted with.
  • Give player speed boost when consumed.
• Add apples around the map.
• Add unit tests for apple class.