display percentage of achievement of todo in markdown

browser/components/TodoListPercentage.styl

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+.percentageBar
+  position absolute
+  background-color #bcbcbc
+  height 20px
+  width 100%
+
+.progressBar
+  background-color #52d8a5
+  height 20px
+  text-align center
+
+.progressBar p
+  color white

browser/components/TodolistPercentage.js

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+/**
+ * @fileoverview Percentage of todo achievement.
+ */
+
+import React, { PropTypes } from 'react'
+import CSSModules from 'browser/lib/CSSModules'
+import styles from './TodoListPercentage.styl'
+
+/**
+ * @param {number} percentageOfTodo
+ */
+
+const TodoListPercentage = ({
+  percentageOfTodo
+}) => (
+    <div styleName='percentageBar'
+      style={{display: isNaN(percentageOfTodo) ? 'none' : ''}}>
+    <div styleName='progressBar' style={{ width: percentageOfTodo + '%'}}>
+        <p styleName='percentageText'>{percentageOfTodo + '%'}</p>
+      </div>
+    </div>
+)
+
+
+TodoListPercentage.propTypes = {
+  percentageOfTodo: PropTypes.number.isRequired
+}
+
+export default CSSModules(TodoListPercentage, styles)