add initial marp implementation with sample content and build configuration

node_modules/speech-rule-engine/js/walker/levels.d.ts

@@ -0,0 +1,12 @@
+export declare class Levels<T> {
+    private level_;
+    push(level: T[]): void;
+    pop(): T[];
+    peek(): T[];
+    indexOf(element: T): number | null;
+    find(pred: (p1: T) => boolean): T | null;
+    get(index: number): T | null;
+    depth(): number;
+    clone(): Levels<T>;
+    toString(): string;
+}