add new phone functionality implemented

- Service used to store and share newly added devices
- Created a form for adding new entries which stores entries in this service
- After fetching new entries from Phone.query() result from NewPhone.getPhones() is concatenated to the list to be displayed

THINGS NOT TAKEN CARE OF -
- UI of the form kind of sucks
- Haven't paid attention to tests in the tutorial, going through them, will add.
Yeah... came to my mind too. What stopped me was not having a good understanding of how the `$resource` service dependency was working in the `Phone` service.
Have read upon it, so will make this change too.