Add examples project

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

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+//
+//  TaskListView.swift
+//  SwiftUITodo
+//
+//  Created by Suyeol Jeon on 03/06/2019.
+//  Copyright © 2019 Suyeol Jeon. All rights reserved.
+//
+
+import SwiftUI
+
+struct TaskListView: View {
+  @EnvironmentObject var userData: UserData
+  @State var draftTitle: String = ""
+  @State var isEditing: Bool = false
+
+  var body: some View {
+    List {
+      TextField($draftTitle, placeholder: Text("Create a New Task..."), onCommit: self.createTask)
+      ForEach(self.userData.tasks) { task in
+        TaskItemView(task: task, isEditing: self.$isEditing)
+      }
+    }
+    .navigationBarItem(title: Text("Tasks 👀"))
+    .navigationBarItems(trailing: Button(action: { self.isEditing.toggle() }) {
+      if !self.isEditing {
+        Text("Edit")
+      } else {
+        Text("Done").bold()
+      }
+    })
+  }
+
+  private func createTask() {
+    let newTask = Task(title: self.draftTitle, isDone: false)
+    self.userData.tasks.insert(newTask, at: 0)
+    self.draftTitle = ""
+  }
+}