Add enemy_manager

enemy_manager

@@ -0,0 +1,28 @@
+import pygame
+import random
+from settings import *
+from enemy import Enemy
+
+
+class EnemyManager:
+    def __init__(self, world, player):
+        self.world = world
+        self.player = player
+        self.enemies = []
+
+        # spawn a few enemies to start
+        for _ in range(5):
+            self.spawn_enemy()
+
+    def spawn_enemy(self):
+        x = random.randint(0, self.world.width * TILE_SIZE)
+        y = (SURFACE_LEVEL - 5) * TILE_SIZE
+        self.enemies.append(Enemy(x, y))
+
+    def update(self, dt):
+        for enemy in self.enemies:
+            enemy.update(dt, self.world, self.player)
+
+    def draw(self, screen, camera):
+        for enemy in self.enemies:
+            enemy.draw(screen, camera)