Created Phone Number Model [Finishes #63842244]

I created the Phone Number model. It has one column, value, which store
the phone number as a string. This column is unique and is test for
uniqueness on both the model and database levels. As well, I’ve
overridden the #to_s method on the model to output the value string.
Created Phone Number to User Relationship [Finishes #63842356]
Added Phone Numbers to Users View [Finishes #63842804]

I added phone numbers to the user profile view. User’s phone numbers
are now visible on the users profile page.
Merge branch 'create-phone-numbers'