Spot.swift convenience initializers

Convenience Initializers for Spot.swift

    init(name: String, address: String, coordinate: CLLocationCoordinate2D, averageRating: Double, numberOfReviews: Int, postingUserID: String, documentID: String) {
        self.name = name
        self.address = address
        self.coordinate = coordinate
        self.averageRating = averageRating
        self.numberOfReviews = numberOfReviews
        self.postingUserID = postingUserID
        self.documentID = documentID
    }
    
    convenience override init() {
        self.init(name: "", address: "", coordinate: CLLocationCoordinate2D(), averageRating: 0.0, numberOfReviews: 0, postingUserID: "", documentID: "")
    }