more info on gulpfile. closes gulpjs#44

Author: Contra

README.md

@@ -33,6 +33,8 @@ You can view a list of plugins by going to [this npm search](https://npmjs.org/s
 
 ## Usage
 
+This code goes in your `Gulpfile.js` (case insensitive) at the root of your project. For more information on how to use other languages check the [compilers](#compilers) section.
+
 ```javascript
 var gulp = require('gulp');
 var jade = require('gulp-jade');