Added Electron.js to free-programming-books-zh (#4761)

* Added Electron.js to free-programming-books-zh

* Rename resource and added provider

free-programming-books-zh.md

@@ -45,6 +45,7 @@
     * [AngularJS](#angularjs)
     * [Backbone.js](#backbonejs)
     * [D3.js](#d3js)
+    * [Electron.js](#electronjs)
     * [ExtJS](#extjs)
     * [impress.js](#impressjs)
     * [jQuery](#jquery)
@@ -505,6 +506,12 @@
   * [楚狂人的D3教程](http://www.cnblogs.com/winleisure/tag/D3.js/)
 
 
+#### Electron.js
+
+  * [Electron 中文文档](https://wizardforcel.gitbooks.io/electron-doc/content) - WizardForcel
+  * [Electron 中文文档](https://www.w3cschool.cn/electronmanual) - W3Cschool
+
+
 #### ExtJS
 
   * [Ext4.1.0 中文文档](http://extjs-doc-cn.github.io/ext4api/)