Add examples project

Examples/InterfacingWithUIKit/StartingPoint/Landmarks/Landmarks/Models/UserData.swift

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+/*
+See LICENSE folder for this sample’s licensing information.
+
+Abstract:
+A model object that stores app data.
+*/
+
+import Combine
+import SwiftUI
+
+final class UserData: BindableObject {
+    let didChange = PassthroughSubject<UserData, Never>()
+    
+    var showFavoritesOnly = false {
+        didSet {
+            didChange.send(self)
+        }
+    }
+
+    var landmarks = landmarkData {
+        didSet {
+            didChange.send(self)
+        }
+    }
+}