add some settings for the sprite assets

src/settings.py

@@ -1,4 +1,24 @@
 # --- DESK ---
+from typing import Mapping, Literal, Tuple
+
 DESK_WIDTH = 70
 DESK_HEIGHT = 40
 
+
+
+# Players Constants / Settings
+# Valid movement/animation directions.
+Direction = Literal["down", "left", "right", "up"]
+
+# Sprite files are grouped by direction.
+# Example: "down" uses sprite_01.png, sprite_02.png, sprite_03.png.
+DIRECTION_FRAMES: Mapping[Direction, Tuple[int, int, int]] = {
+    "down": (1, 2, 3),
+    "left": (4, 5, 6),
+    "right": (7, 8, 9),
+    "up": (10, 11, 12),
+}
+
+# Default drawing size and animation speed.
+DEFAULT_SPRITE_HEIGHT: int = 138
+DEFAULT_FRAME_TIME: float = 0.16