add initial marp implementation with sample content and build configuration

node_modules/mj-context-menu/js/menu_element.d.ts

@@ -0,0 +1,16 @@
+import { AbstractNavigatable } from './abstract_navigatable.js';
+import { HtmlClass } from './html_classes.js';
+import { Element } from './element.js';
+export declare abstract class MenuElement extends AbstractNavigatable implements Element {
+    protected role: string;
+    protected className: HtmlClass;
+    private _html;
+    addAttributes(attributes: {
+        [attr: string]: string;
+    }): void;
+    get html(): HTMLElement;
+    set html(html: HTMLElement);
+    generateHtml(): void;
+    focus(): void;
+    unfocus(): void;
+}