Scaffold the project: pyproject, gitignore, constants, Doxyfile, README, CI

Task: MIL-002#1
Task: MIL-002#2
Task: MIL-002#3
Task: MIL-002#4
Task: MIL-002#5

tests/test_constants.py

@@ -0,0 +1,15 @@
+"""Smoke tests for the constants module."""
+
+from constants import CAR_HEIGHT, CAR_LENGTH, COLORS, SAFE_ZONE, SCREEN_HEIGHT
+
+
+def test_car_footprint_matches_assignment() -> None:
+    assert (CAR_LENGTH, CAR_HEIGHT) == (40, 20)
+
+
+def test_safe_zone_leaves_room_for_cars() -> None:
+    assert 0 < SAFE_ZONE < SCREEN_HEIGHT / 2
+
+
+def test_colors_are_not_empty() -> None:
+    assert COLORS