Add favorite-button.

src/components/favorite_button/favorite_button.vue

@@ -0,0 +1,14 @@
+<template>
+  <div>
+    <i :class='classes' class='favorite-button fa' v-on:click.prevent='favorite()'></i>
+    <span v-if='status.fave_num > 0'>{{status.fave_num}}</span>
+  </div>
+</template>
+
+<script src="./favorite_button.js" ></script>
+
+<style>
+ .favorite-button {
+     cursor: pointer
+ }
+</style>