maint: added livewatch asset

Assets/Plugins/LiveWatchLite/TowerDefenceDemo/Scripts/PoolManager.cs

@@ -0,0 +1,42 @@
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Pool;
+
+namespace Ingvar.LiveWatch.TowerDefenceDemo
+{
+    public class PoolManager : MonoBehaviour
+    {
+        private Dictionary<GameObject, Stack<GameObject>> _prefabToPools = new();
+        private Dictionary<GameObject, Stack<GameObject>> _objectToPools = new();
+
+        public GameObject Get(GameObject prefab)
+        {
+            var pool = GetPool(prefab);
+            var pooledObject = pool.Count > 0 ? pool.Pop() : Instantiate(prefab);
+            _objectToPools[pooledObject] = pool;
+
+            pooledObject.SetActive(true);
+            return pooledObject;
+        }
+
+        public void Push(GameObject pooledObject)
+        {
+            var pool = _objectToPools[pooledObject];
+            pool.Push(pooledObject);
+            
+            pooledObject.SetActive(false);
+            pooledObject.transform.SetParent(transform);
+        }
+        
+        private Stack<GameObject> GetPool(GameObject prefab)
+        {
+            if (_prefabToPools.TryGetValue(prefab, out var pool))
+                return pool;
+
+            pool = new Stack<GameObject>();
+            _prefabToPools.Add(prefab, pool);
+
+            return pool;
+        }
+    }
+}