Add examples project

Examples/BuildingListsAndNavigation/Complete/Landmarks/Landmarks/LandmarkList.swift

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+/*
+See LICENSE folder for this sample’s licensing information.
+
+Abstract:
+A view showing a list of landmarks.
+*/
+
+import SwiftUI
+
+struct LandmarkList: View {
+    var body: some View {
+        NavigationView {
+            List(landmarkData) { landmark in
+                NavigationButton(destination: LandmarkDetail(landmark: landmark)) {
+                    LandmarkRow(landmark: landmark)
+                }
+            }
+            .navigationBarTitle(Text("Landmarks"), displayMode: .large)
+        }
+    }
+}
+
+#if DEBUG
+struct LandmarkList_Previews: PreviewProvider {
+    static var previews: some View {
+        ForEach(["iPhone SE", "iPhone XS Max"].identified(by: \.self)) { deviceName in
+            LandmarkList()
+                .previewDevice(PreviewDevice(rawValue: deviceName))
+                .previewDisplayName(deviceName)
+        }
+    }
+}
+#endif