Add markdown format support (#25)

Co-authored-by: Dawid Dziurla <dawidd0811@gmail.com>

node_modules/showdown/src/loader.js

@@ -0,0 +1,17 @@
+var root = this;
+
+// AMD Loader
+if (typeof define === 'function' && define.amd) {
+  define(function () {
+    'use strict';
+    return showdown;
+  });
+
+// CommonJS/nodeJS Loader
+} else if (typeof module !== 'undefined' && module.exports) {
+  module.exports = showdown;
+
+// Regular Browser loader
+} else {
+  root.showdown = showdown;
+}