Vue.js Todo App

• Create index.html
• Add Vue.js to index.html
• Create a Vue instance in app.js
• Show message from Vue instance on page
• Create New Todo Form
• Call a function when the form is submitted
• Create a string property on our data to store the user input
  • Watch the property change as we type in the input
• Log the user input when the form is submitted
• Create an array property on our data for todos
• Push the new todo into the todos array, with done: false
• Show the todos in a list
• Check done on a todo to mark it as done
  • Show a line through the todo text
• Add a button to delete a todo
• Add a button to mark all todos as done