1. Create your PhoneGap project
2. Download AngularJS, and save it somewhere accessible by the www\index.html page (e.g. in the www\js folder)
3. Add a reference to the new file to the www\index.html page.
4. Add your AngularJS code
5. Your AngularJS app needs to be bootstrapped on deviceready. One way to do this is to add a function to call angular.bootstrap(document, ['appName']), and attach an event listener to the document to call the function on deviceready.

References
The Definitive Guide to Angular on Mobile