created main shadow element to store main app

src/components/app-shadow/AppShadowElement.ts

@@ -0,0 +1,26 @@
+import { attr, targets, controller, target } from "@github/catalyst";
+import { closest, index, update, isTrue } from "core/utils";
+import { html, render, until } from "@github/jtml";
+import { PingService } from "services/";
+import { AppService, HttpClient, RouterService } from "core/services";
+import { AuthStore } from "core/store";
+
+@controller
+class AppShadowElement extends HTMLElement {
+    constructor() {
+        super();
+    }
+
+    @update
+    connectedCallback() {
+        this.attachShadow({ mode: "open" });
+    }
+
+    render() {
+        return html` <app-main></app-main> `;
+    }
+
+    update() {
+        render(this.render(), this.shadowRoot!);
+    }
+}