Update cookies documentation

src/ngCookies/cookies.js

@@ -17,6 +17,17 @@ angular.module('ngCookies', ['ng']).
    *
    * Only a simple Object is exposed and by adding or removing properties to/from
    * this object, new cookies are created/deleted at the end of current $eval.
+   * 
+   * # Installation
+   * To use $cookies make sure you have included the `angular-cookies.js` that comes in Angular
+   * package. You can also find this file on Google CDN, bower as well as at
+   * {@link http://code.angularjs.org/ code.angularjs.org}.
+   *
+   * Finally load the module in your application:
+   *
+   *        angular.module('app', ['ngCookies']);
+   *
+   * and you are ready to get started!
    *
    * @example
    <doc:example>