created base layouts and fixed structure

src/layouts/menu-layout/MenuLayoutElement.ts

@@ -0,0 +1,25 @@
+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 { BaseLayoutElement } from "common/layouts";
+
+@controller
+class MenuLayoutElement extends BaseLayoutElement {
+    constructor() {
+        super();
+    }
+
+    @update
+    connectedCallback() {}
+
+    update() {
+        render(
+            html`
+                <div>Menu</div>
+                <div data-target="menu-layout.slotted"></div>
+            `,
+            this
+        );
+    }
+}