docs(guide/external-resources): add links to Atom and Vim packages

Add links to packages for Atom and Vim editors under editor support
subsection under tools section.
PR (angular#15000)

Author: Roshan Jossey

docs/content/guide/external-resources.ngdoc

@@ -74,7 +74,7 @@ This is a collection of external, 3rd party resources for learning and developin
 
 * **Getting Started:** [Comparison of the options for starting a new project](http://www.dancancro.com/comparison-of-angularjs-application-starters/)
 * **Debugging:** [Batarang](https://chrome.google.com/webstore/detail/angularjs-batarang/ighdmehidhipcmcojjgiloacoafjmpfk?hl=en)
-* **Editor support:** [Webstorm](http://plugins.jetbrains.com/plugin/6971) (and [video](http://www.youtube.com/watch?v=LJOyrSh1kDU)), [Sublime Text](https://github.com/angular-ui/AngularJS-sublime-package), [Visual Studio](http://madskristensen.net/post/angularjs-intellisense-in-visual-studio-2012)
+* **Editor support:** [Webstorm](http://plugins.jetbrains.com/plugin/6971) (and [video](http://www.youtube.com/watch?v=LJOyrSh1kDU)), [Sublime Text](https://github.com/angular-ui/AngularJS-sublime-package), [Visual Studio](http://madskristensen.net/post/angularjs-intellisense-in-visual-studio-2012), [Atom](https://github.com/angular-ui/AngularJS-Atom), [Vim](https://github.com/burnettk/vim-angular)
 * **Workflow:** [Yeoman.io](https://github.com/yeoman/generator-angular) and [Angular Yeoman Tutorial](http://www.sitepoint.com/kickstart-your-angularjs-development-with-yeoman-grunt-and-bower/)
 
 ## Complementary Libraries