set up demo, exercise, final folders

step1-06/exercise/src/components/TodoFooter.tsx

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+import React from 'react';
+
+export const TodoFooter = (props: any) => {
+  const itemCount = Object.keys(props.todos).filter(id => !props.todos[id].completed).length;
+  return (
+    <footer>
+      <span>4 items left</span>
+      <button className="submit">Clear Completed</button>
+    </footer>
+  );
+};

step1-06/exercise/src/components/TodoHeader.tsx

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+import React from 'react';
+
+export class TodoHeader extends React.Component<any, any> {
+  constructor(props) {
+    super(props);
+    this.state = { labelInput: '' };
+  }
+
+  render() {
+    const { filter } = this.props;
+
+    return (
+      <header>
+        <h1>todos</h1>
+        <div className="addTodo">
+          <input value={this.state.labelInput} onChange={this._onChange} className="textfield" placeholder="add todo" />
+          <button className="submit">Add</button>
+        </div>
+        <nav className="filter">
+          <button className={filter == 'all' ? 'active' : ''}>all</button>
+          <button className={filter == 'active' ? 'active' : ''}>active</button>
+          <button className={filter == 'completed' ? 'active' : ''}>completed</button>
+        </nav>
+      </header>
+    );
+  }
+  _onChange = evt => {
+    this.setState({ labelInput: evt.target.value });
+  };
+}

step1-06/exercise/src/components/TodoList.tsx

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+import React from 'react';
+import { TodoListItem } from './TodoListItem';
+
+export class TodoList extends React.Component<any, any> {
+  render() {
+    const { filter, todos } = this.props;
+
+    const filteredTodos = Object.keys(todos).filter(id => {
+      return filter === 'all' || (filter === 'completed' && todos[id].completed) || (filter === 'active' && !todos[id].completed);
+    });
+    return (
+      <ul className="todos">
+        {filteredTodos.map(id => (
+          <TodoListItem key={id} {...todos[id]} />
+        ))}
+      </ul>
+    );
+  }
+}

step1-06/exercise/src/components/TodoListItem.tsx

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+import React from 'react';
+
+export class TodoListItem extends React.Component<any, any> {
+  render() {
+    return (
+      <li className="todo">
+        <label>
+          <input type="checkbox" /> Todo 1
+        </label>
+      </li>
+    );
+  }
+}