add initial marp implementation with sample content and build configuration

node_modules/bare-fs/lib/errors.d.ts

@@ -0,0 +1,11 @@
+declare class FileError extends Error {
+  private constructor(msg: string)
+
+  readonly code: string
+  readonly operation?: string
+  readonly path?: string
+  readonly destination?: string
+  readonly fd?: number
+}
+
+export = FileError