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.
As mentioned in the other PR, all data manipulation would better fit inside Phone service.