Add table of requirements

README.md

@@ -13,10 +13,14 @@ Sage is a WordPress starter theme based on HTML5 Boilerplate, gulp, Bower, and B
 
 ## Requirements
 
-* PHP >= 5.4
-* Node.js >= 0.12.0
-* gulp (`npm install -g gulp`)
-* Bower (`npm install -g bower`)
+| Prerequisite    | How to check | How to install
+| --------------- | ------------ | ------------- |
+| PHP >= 5.4.x    | `php -v`     | [php.net](http://php.net/manual/en/install.php) |
+| Node.js 0.12.x  | `node -v`    | [nodejs.org](http://nodejs.org/) |
+| gulp >= 3.8.10  | `gulp -v`    | `npm install -g gulp` |
+| Bower >= 1.3.12 | `bower -v`   | `npm install -g bower` |
+
+For more installation notes, refer to the [Install gulp and Bower](#install-gulp-and-bower) section in this document.
 
 ## Features