feat: update readme

Author: foryuki

examples/.storybook/manager-head.html

@@ -1,4 +1,4 @@
 <script>
   document.title = "One React"
 </script>
-<link rel="icon" type="image/ico" href="favicon.ico" />
+<link rel="shortcut icon" type="image/png" href="favicon.png"/>

examples/public/favicon.ico

@@ -1,6 +1,8 @@
 # One React Component: sample
 > one react component: sample
 
+<p align="center"><img width="100" src="https://cdn.rawgit.com/one-react/assets/23f3d48f/logo.png" alt="logo"></p>
+
 [![TravisCI Build](https://img.shields.io/travis/one-react/sample.svg)](https://travis-ci.org/one-react/sample)
 [![CircieCI Build](https://img.shields.io/circleci/project/github/one-react/sample.svg)](https://circleci.com/gh/one-react/sample)
 [![Coverage](https://img.shields.io/codecov/c/github/one-react/sample.svg)](https://codecov.io/gh/one-react/sample)