add initial marp implementation with sample content and build configuration

node_modules/get-uri/dist/notmodified.d.ts

@@ -0,0 +1,10 @@
+/**
+ * Error subclass to use when the source has not been modified.
+ *
+ * @param {String} message optional "message" property to set
+ * @api protected
+ */
+export default class NotModifiedError extends Error {
+    code: string;
+    constructor(message?: string);
+}