Update

Assets/D.A. Assets/DA-Shared/Runtime/Singleton/StaticSingleton.cs

@@ -0,0 +1,21 @@
+using System;
+
+namespace DA_Assets.Singleton
+{
+    public class StaticSingleton<T>
+    {
+        private static T instance;
+        public static T Instance
+        {
+            get
+            {
+                if (instance == null)
+                {
+                    instance = Activator.CreateInstance<T>();
+                }
+
+                return instance;
+            }
+        }
+    }
+}