add initial marp implementation with sample content and build configuration

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

@@ -0,0 +1,14 @@
+import { Item } from './item.js';
+import { Postable } from './postable.js';
+import { VariablePool } from './variable_pool.js';
+import { KeyNavigatable } from './key_navigatable.js';
+import { MouseNavigatable } from './mouse_navigatable.js';
+export interface Menu extends Postable, KeyNavigatable, MouseNavigatable {
+    baseMenu: Menu;
+    items: Item[];
+    pool: VariablePool<string | boolean>;
+    focused: Item;
+    unpostSubmenus(): void;
+    find(id: string): Item;
+    generateMenu(): void;
+}