Added the character's image specifications

Entity-Design.md

@@ -16,4 +16,22 @@ The entities in the world (including players, NPCs, monsters, trees, interactive
 
 ## Inheritance Tree
 
-![inheritance tree diagram](images/inheritance-tree.png)
+![inheritance tree diagram](images/inheritance-tree.png)
+
+## Character Specifications
+
+#### Sprite Sheet
+
+Any character will need a spritesheet. These sprite sheets can be shared bewtween characters, but they must conform to specific dimentions and layouts. The current specification is as follows:
+
+* A 4*4 grid of 32px*48px cells
+* The horizontal cells show four images of animation
+* The vertical cells show the character moving in four directions, in this order:
+	1. South (Down)
+	2. North (Up)
+	3. East (Left)
+	4. West (Right)
+
+#### Example
+
+![elliot spritesheet](images/elliot2.png)