Angularjs App build contact manager follow below link:

http://www.creativebloq.com/write-app-angularjs-5133776

Start learning Angularjs follow below link:

http://spiiice.net/getting-started-with-angularjs/

Angularjs important service $service learn from below site:

http://ruoyusun.com/2013/08/24/a-glimpse-of-angularjs-scope-via-example.html