Add vue theme

lib/plugins/nav.js

@@ -0,0 +1,18 @@
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+  typeof define === 'function' && define.amd ? define(factory) :
+  (global.Docsify = global.Docsify || {}, global.Docsify.Nav = factory());
+}(this, (function () { 'use strict';
+
+var Nav = function () {
+  console.log(this);
+};
+Nav.name = 'Doscify.Nav';
+
+if (window.Docsify) {
+  window.Docsify.use(Nav);
+}
+
+return Nav;
+
+})));