add: waterfall init

packages/waterfall/src/main.vue

@@ -0,0 +1,18 @@
+<template>
+  <div>
+    <h2>author: {{ author }}</h2>
+    <div>Hello {{ name }}</div>
+  </div>
+</template>
+
+<script>
+  export default {
+    name: 'Sample',
+    props: ['author'],
+    data() {
+      return {
+        name: 'World'
+      };
+    }
+  };
+</script>