class FirebaseManager: NSObject {
    static let databbaseRef = Database.database().reference()
    static var currentUserId:String = ""
    static var currentUser:User?

    static func Login(email:String, password:String, completion: @escaping (_ success:Bool) -> Void) {
        Auth.auth().signIn(withEmail: email, password: password, completion: { (user,error) in
            if let error = error {
                print(error.localizedDescription)
                completion(false)
            } else {
                currentUser = user
                currentUserId = (user?.uid)!
                completion(true) }

static var currentUser:User?

static var currentUser: FirebaseAuth.User?