added hotreload

Packages/com.singularitygroup.hotreload/Editor/Installation/ExponentialBackoff.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace SingularityGroup.HotReload.Editor {
+    static class ExponentialBackoff {
+        
+        public static TimeSpan GetTimeout(int attempt, int minBackoff = 250, int maxBackoff = 60000, int deltaBackoff = 400) {
+            attempt = Math.Min(25, attempt); // safety to avoid overflow below
+
+            var delta = (uint)(
+                (Math.Pow(2.0, attempt) - 1.0)
+                * deltaBackoff 
+            );
+
+            var interval = Math.Min(checked(minBackoff + delta), maxBackoff);
+            return TimeSpan.FromMilliseconds(interval);
+        }
+    }
+}