Add examples project

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

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+//
+//  TaskItemView.swift
+//  SwiftUITodo
+//
+//  Created by Suyeol Jeon on 03/06/2019.
+//  Copyright © 2019 Suyeol Jeon. All rights reserved.
+//
+
+import SwiftUI
+
+struct TaskItemView: View {
+  @EnvironmentObject var userData: UserData
+
+  let task: Task
+  @Binding var isEditing: Bool
+
+  var body: some View {
+    return HStack {
+      if self.isEditing {
+        Image(systemName: "minus.circle")
+          .foregroundColor(.red)
+          .tapAction(count: 1) {
+            self.delete()
+          }
+        NavigationButton(destination: TaskEditView(task: task).environmentObject(self.userData)) {
+          Text(task.title)
+        }
+      } else {
+        Button(action: { self.toggleDone() }) {
+          Text(self.task.title)
+        }
+        Spacer()
+        if task.isDone {
+          Image(systemName: "checkmark").foregroundColor(.green)
+        }
+      }
+    }
+  }
+
+  private func toggleDone() {
+    guard !self.isEditing else { return }
+    guard let index = self.userData.tasks.firstIndex(where: { $0.id == self.task.id }) else { return }
+    self.userData.tasks[index].isDone.toggle()
+  }
+
+  private func delete() {
+    self.userData.tasks.removeAll(where: { $0.id == self.task.id })
+    if self.userData.tasks.isEmpty {
+      self.isEditing = false
+    }
+  }
+}