maint: added livewatch asset

Assets/Plugins/LiveWatchLite/Scripts/Utilities/Singleton.cs

@@ -0,0 +1,22 @@
+using System.IO;
+using UnityEngine;
+
+namespace Ingvar.LiveWatch
+{
+    public abstract class Singleton<T> where T : new()
+    {
+        public static T instance
+        {
+            get
+            {
+                if (_instance != null)
+                    return _instance;
+
+                _instance = new T();
+                return _instance;
+            }
+        }
+
+        private static T _instance;
+    }
+}