maint: added livewatch asset

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

@@ -0,0 +1,59 @@
+using System;
+using UnityEngine;
+
+namespace Ingvar.LiveWatch.TowerDefenceDemo
+{
+    public class HealthManager : MonoBehaviour
+    {
+        public event Action HealthChanged;
+        
+        public int CurrentHealth
+        {
+            get => _health;
+            set
+            {
+                if (_health == value)
+                    return;
+
+                _health = value;
+                HealthChanged?.Invoke();
+            }
+        }
+        public int MaxHealth => _levelScene.LevelConfig.MaxHealth;
+
+        private LevelScene _levelScene;
+        private int _health;
+        
+        private void Awake()
+        {
+            _levelScene = FindObjectOfType<LevelScene>();
+        }
+        
+        private void Start()
+        {
+            Watch.GetOrAdd("Health", () => CurrentHealth)
+                .SetSortOrder(TD_WatchSortOrder.Health);
+        }
+
+        private void OnEnable()
+        {
+            _levelScene.MobManager.MobReachedFinish += OnMobReachedFinish;
+        }
+
+        private void OnDisable()
+        {
+            _levelScene.MobManager.MobReachedFinish -= OnMobReachedFinish;
+        }
+
+        public void ResetHealth()
+        {
+            CurrentHealth = MaxHealth;
+        }
+        
+        private void OnMobReachedFinish(MobMain mob)
+        {
+            CurrentHealth = Mathf.Clamp(CurrentHealth - 1, 0, MaxHealth);
+            HealthChanged?.Invoke();
+        }
+    }
+}