Todo App Step 1

main.dart

// Import MaterialApp and other widgets which we can use to quickly create a material app
import 'package:flutter/material.dart';

// Code written in Dart starts exectuting from the main function. runApp is part of
// Flutter, and requires the component which will be our app's container. In Flutter,
// every component is known as a "widget".
void main() => runApp(new TodoApp());

// Every component in Flutter is a widget, even the whole app itself
class TodoApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Todo List',
      home: new Scaffold(
        appBar: new AppBar(
          title: new Text('Todo List')
        )
      ),
    );
  }
}