added base element

app/boot.ts

@@ -1,7 +1,10 @@
 import './app.less';
 import bootHtml from './app.html';
+import { AppRoot } from './elements/app-root/app-root';
 
-var appEle = document.createElement("app-root");
+window.customElements.define('app-root', AppRoot);
+
+var appEle = document.createElement("div");
 appEle.innerHTML = bootHtml;
 
 document.body.appendChild(appEle);