Add FriendRequest

[catherinettt]

FriendRequest: (user_id, friend_id)

and also:
POST sendrequest - BODY: {user_id: 123, user_id: 456}
GET getrequest/user_id RETURN: {frind_name: mike, friend_request_id: 111}
POST acceptrequest/friend_request_id BODY: {}

[catherinettt]

basic structure created.
commit 2186df0