Add Async image loading

Examples/Async image loading/RemoteImage/RemoteImageView.swift

@@ -0,0 +1,30 @@
+//
+//  RemoteImageView.swift
+//  Landmarks
+//
+//  Created by Callum Trounce on 06/06/2019.
+//  Copyright © 2019 Apple. All rights reserved.
+//
+
+import Foundation
+import SwiftUI
+
+@available(iOS 13.0, *)
+public struct RemoteImageView: View {
+    
+    var url: URL
+    
+    var placeholderImage: Image?
+    
+    @State
+    var remoteImage: RemoteImage = RemoteImage()
+    
+    public var body: some View {
+        return (remoteImage.load(url: url).image ?? placeholderImage)?.resizable()
+    }
+    
+    public init(url: URL, placeholderImage: Image? = nil) {
+        self.placeholderImage = placeholderImage
+        self.url = url
+    }
+}