add initial marp implementation with sample content and build configuration

node_modules/@marp-team/marpit/lib/theme/symbol.js

@@ -0,0 +1,8 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+// This symbol is for internal to skip name validation when creating theme.
+var _default = exports.default = Symbol('skipThemeValidation');