(feat) Restaurant's sign-up sends server lat and long coordinates based ...

...on submitted address

@phoenix16t, when a restaurant signs up and enters their address, the geo-coordinates of the address get calculated and sent to the server as extra properties of the object (specifically, lat and long).

```
{
  restaurantName: restaurantName,
  address: address,
  lat: lat,
  long: long,
  priceRange: priceRange,
  cuisine: cuisine,
  email: email,
  phoneNumber: phoneNumber,
  password: password
}
```