add initial marp implementation with sample content and build configuration

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

@@ -0,0 +1,18 @@
+export declare enum KEY {
+    RETURN = 13,
+    ESCAPE = 27,
+    SPACE = 32,
+    LEFT = 37,
+    UP = 38,
+    RIGHT = 39,
+    DOWN = 40
+}
+export interface KeyNavigatable {
+    keydown(event: KeyboardEvent): void;
+    escape(event: KeyboardEvent): void;
+    space(event: KeyboardEvent): void;
+    left(event: KeyboardEvent): void;
+    right(event: KeyboardEvent): void;
+    up(event: KeyboardEvent): void;
+    down(event: KeyboardEvent): void;
+}