adding back docs

docs/step1-05/exercise/src/components/TodoFooter.tsx

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+import React from 'react';
+
+export const TodoFooter = (props: any) => {
+  return (
+    <footer>
+      <p>footer</p>
+    </footer>
+  );
+};

docs/step1-05/exercise/src/components/TodoHeader.tsx

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+import React from 'react';
+
+export class TodoHeader extends React.Component {
+  render() {
+    return (
+      <header>
+        <h1>todos</h1>
+        <div className="addTodo">
+          <input className="textfield" placeholder="add todo" />
+          <button className="submit">Add</button>
+        </div>
+        <nav className="filter">
+          <button className="completed">all</button>
+          <button>active</button>
+          <button>completed</button>
+        </nav>
+      </header>
+    );
+  }
+}

docs/step1-05/exercise/src/components/TodoList.tsx

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+import React from 'react';
+
+export class TodoList extends React.Component<any, any> {
+  render() {
+    return <div />;
+  }
+}

docs/step1-05/exercise/src/components/TodoListItem.tsx

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