add initial marp implementation with sample content and build configuration

node_modules/mathjax-full/js/output/chtml/Wrappers/mfenced.d.ts

@@ -0,0 +1,7 @@
+import { CHTMLConstructor } from '../Wrapper.js';
+declare const CHTMLmfenced_base: import("../../common/Wrappers/mfenced.js").MfencedConstructor & CHTMLConstructor<any, any, any>;
+export declare class CHTMLmfenced<N, T, D> extends CHTMLmfenced_base {
+    static kind: string;
+    toCHTML(parent: N): void;
+}
+export {};