Add examples project

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

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+//
+//  TaskEditView.swift
+//  SwiftUITodo
+//
+//  Created by Suyeol Jeon on 03/06/2019.
+//  Copyright © 2019 Suyeol Jeon. All rights reserved.
+//
+
+import SwiftUI
+
+struct TaskEditView: View {
+  @EnvironmentObject var userData: UserData
+  private let task: Task
+  private var draftTitle: State<String>
+
+  init(task: Task) {
+    self.task = task
+    self.draftTitle = .init(initialValue: task.title)
+  }
+
+  var body: some View {
+    let inset = EdgeInsets(top: -8, leading: -10, bottom: -7, trailing: -10)
+    return VStack(alignment: .leading, spacing: 0) {
+      TextField(
+        self.draftTitle.binding,
+        placeholder: Text("Enter New Title..."),
+        onEditingChanged: { _ in self.updateTask() },
+        onCommit: {}
+      )
+      .background(
+        RoundedRectangle(cornerRadius: 5)
+          .fill(Color.clear)
+          .border(Color(red: 0.7, green: 0.7, blue: 0.7), width: 1 / UIScreen.main.scale, cornerRadius: 5)
+          .padding(inset)
+      )
+      .padding(EdgeInsets(
+        top: 15 - inset.top,
+        leading: 20 - inset.leading,
+        bottom: 15 - inset.bottom,
+        trailing: 20 - inset.trailing
+      ))
+
+      Spacer()
+    }
+    .navigationBarTitle(Text("Edit Task 📝"))
+  }
+
+  private func updateTask() {
+    guard let index = self.userData.tasks.firstIndex(of: self.task) else { return }
+    self.userData.tasks[index].title = self.draftTitle.value
+  }
+}