Add examples project

Examples/Example To-Do App/SwiftUITodo/UserData.swift

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+//
+//  UserData.swift
+//  SwiftUITodo
+//
+//  Created by Suyeol Jeon on 03/06/2019.
+//  Copyright © 2019 Suyeol Jeon. All rights reserved.
+//
+
+import Combine
+import SwiftUI
+
+private let defaultTasks: [Task] = [
+  Task(title: "Read SwiftUI Documentation 📚", isDone: false),
+  Task(title: "Watch WWDC19 Keynote 🎉", isDone: true),
+]
+
+final class UserData: BindableObject {
+  let didChange = PassthroughSubject<UserData, Never>()
+
+  @UserDefaultValue(key: "Tasks", defaultValue: defaultTasks)
+  var tasks: [Task] {
+    didSet {
+      didChange.send(self)
+    }
+  }
+}