Add Async image loading

Examples/Drawing Paths And Shapes/Complete/Landmarks/Landmarks/Supporting Views/CircleImage.swift

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+/*
+See LICENSE folder for this sample’s licensing information.
+
+Abstract:
+A view that clips an image to a circle and adds a stroke and shadow.
+*/
+
+import SwiftUI
+
+struct CircleImage: View {
+    var image: Image
+
+    var body: some View {
+        image
+            .clipShape(Circle())
+            .overlay(Circle().stroke(Color.white, lineWidth: 4))
+            .shadow(radius: 10)
+    }
+}
+
+#if DEBUG
+struct CircleImage_Previews: PreviewProvider {
+    static var previews: some View {
+        CircleImage(image: Image("turtlerock"))
+    }
+}
+#endif