Added link to vue.js (SharePoint#2055)

Author: s-KaiNet

docs/spfx/tools-and-libraries.md

@@ -27,6 +27,7 @@ You can choose any one of a number of JavaScript frameworks to develop client-si
 * [React](https://facebook.github.io/react/)
 * [AngularJS 1.x](https://docs.angularjs.org/tutorial)
 * [Angular 2 for TypeScript 2.x](https://angular.io/guide/quickstart)
+* [Vue.js](https://vuejs.org/)
 * [Handlebars](http://handlebarsjs.com/)
 
 Because client-side web parts are components that are dropped into a SharePoint page, we recommend that you choose a JavaScript framework that supports a similar component model. Lightweight frameworks such as React, Handlebars, and Angular 2 all support a component model and are well suited to building client-side web parts.