Add github star button

Author: simsim0709

docs/.vuepress/components/GithubStarButton.vue

@@ -0,0 +1,10 @@
+<template>
+  <iframe
+    src="https://ghbtns.com/github-btn.html?user=learn-vuejs&repo=vue-patterns&type=star&count=true&size=large"
+    frameborder="0"
+    scrolling="0"
+    width="145px"
+    height="30px"
+  >
+  </iframe>
+</template>

docs/README.md

@@ -3,10 +3,13 @@ home: true
 heroImage: /learn-vue-logo.png
 actionText: Get Started →
 actionLink: /patterns/
-footer: MIT Licensed | Copyright © 2018-present Ilkwon Sim
 ---
 
 <div class="hero">
+  <p class="action">
+    <GithubStarButton></GithubStarButton>
+  </p>
+
   <a href="https://gumroad.com/a/462206067" target="_blank" rel="noopener noreferrer">
     <img src="https://www.fullstack.io/assets/images/vue-github.png" alt="Fullstack Vue Book">
   </a>