Add jQuery style guide link

Author: nschonni

CONTRIBUTING.md

@@ -3,9 +3,10 @@
 Thanks for contributing! Here's a few guidelines to help your contribution get landed.
 
 1. Make sure the problem you're addressing is reproducible. Use jsbin.com or jsfiddle.net to provide a test page.
-2. Add or update unit tests along with your patch. Run the unit tests in at least one browser (see below).
-3. Run `grunt` (see below) to check for linting and a few other issues.
-4. Describe the change in your commit message and reference the ticket, like this: "Fixed delegate bug for dynamic-totals demo. Fixes #51". If you're adding a new localization file, use something like this: "Added croatian (HR) localization"
+2. Follow the [jQuery style guide](http://contribute.jquery.com/style-guides/js)
+3. Add or update unit tests along with your patch. Run the unit tests in at least one browser (see below).
+4. Run `grunt` (see below) to check for linting and a few other issues.
+5. Describe the change in your commit message and reference the ticket, like this: "Fixed delegate bug for dynamic-totals demo. Fixes #51". If you're adding a new localization file, use something like this: "Added croatian (HR) localization"
 
 ## Unit Tests