Add the comments about how to use native view update helper

Author: dreampiggy

Example/SDWebImageSwiftUIDemo/ContentView.swift

@@ -85,6 +85,11 @@ struct ContentView: View {
                         if self.animated {
                             #if os(macOS) || os(iOS) || os(tvOS)
                             AnimatedImage(url: URL(string:url))
+                            /**
+                             .onViewUpdate { view, context in
+                                 view.toolTip = "Mouseover Tip"
+                             }
+                             */
                             .indicator(SDWebImageActivityIndicator.medium)
                             /**
                             .placeholder(UIImage(systemName: "photo"))

README.md

@@ -133,6 +133,9 @@ var body: some View {
         // Bundle (not Asset Catalog)
         AnimatedImage(name: "animation1", isAnimating: $isAnimating)) // Animation control binding
         .maxBufferSize(.max)
+        .onViewUpdate { view, context in // Advanced native view coordinate
+            view.toolTip = "Mouseover Tip"
+        }
     }
 }
 ```