Add initial game structure with entity, player, and screen management

src/game.py

@@ -0,0 +1,21 @@
+import pygame
+from screen import Screen
+from player import Player
+
+class Game:
+    def __init__(self):
+        self.screen_manager = Screen()
+        self.screen = self.screen_manager.get_screen()
+
+        self.running = True
+
+        self.player = Player(self.screen_manager)
+
+    def run(self):
+        while (self.running):
+            for event in pygame.event.get():
+                if event.type == pygame.QUIT:
+                    self.running = False
+
+            self.player.draw()
+            pygame.display.flip()