Added simple enemy spawner

Assets/Entities/Enemies/EnemySpawner.prefab

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+  _spawnRate: 5
+  _spawnEnemies: 1
+  _timeToNextSpawn: 0

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Assets/Entities/Scripts/EnemySpawner.cs

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+using UnityEngine;
+
+namespace AsteroidGame
+{
+    public class EnemySpawner : MonoBehaviour
+    {
+        [Header("Parameters")]
+        [SerializeField] private GameObject _enemyPrefab;
+        [SerializeField] [Range(0.1f, 60f)] private float _spawnRate = 60f;
+        [SerializeField] private bool _spawnEnemies;
+
+        [Header("State")]
+        [SerializeField] private float _timeToNextSpawn;
+
+        private void Start()
+        {
+            _timeToNextSpawn = 0;
+        }
+
+        private void Update()
+        {
+            if (!_spawnEnemies) return;
+
+            _timeToNextSpawn -= Time.deltaTime;
+
+            if (!(_timeToNextSpawn <= 0)) return;
+
+            var newEnemy = Instantiate(_enemyPrefab, transform);
+            newEnemy.transform.parent = transform;
+
+            _timeToNextSpawn = _spawnRate;
+        }
+    }
+}

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