reorg step0

step1-05/src/components/TodoHeader.tsx

@@ -1,20 +1,15 @@
 import React from 'react';
 
 export class TodoHeader extends React.Component {
-
   render() {
     return (
       <div>
         <h1>todos</h1>
-        <input className="textfield" />
-        <button  className="button add">
-          Add
-        </button>
+        <input className="textfield" placeholder="add todo" />
+        <button className="button add">Add</button>
         <div className="filter">
-          <button className="active">
-            all
-          </button>
-          <button >active</button>
+          <button className="active">all</button>
+          <button>active</button>
           <button>completed</button>
         </div>
       </div>