fork from 1.3

FreeSR.Shared/Singleton.cs

@@ -0,0 +1,10 @@
+namespace FreeSR.Shared
+{
+    public abstract class Singleton<T> where T : class
+    {
+        private static readonly Lazy<T> instance = new Lazy<T>(() =>
+            Activator.CreateInstance(typeof(T), true) as T);
+
+        public static T Instance => instance.Value;
+    }
+}