add auto generate example js

docs/components/example-block.vue

@@ -0,0 +1,14 @@
+<template>
+  <div class="example-block">
+    <h2 class="demo-sub-title" v-text="title"></h2>
+    <slot></slot>
+  </div>  
+</template>
+
+<script>
+export default {
+  props: {
+    title: String
+  }
+};
+</script>