public async Task<User> Login(string username, string password)
		{
            User user = new User();
            var users = await client.GetTable<User>().Where(u => u.Username == username).ToListAsync();
            if(users.Count > 0)
            {
                user = users[0];
            }
            else
            {
			    user = new User { Username = username, Password = password };
                await client.GetTable<User>().InsertAsync(user);
            }
			return user;
		}
        public async Task<User> Register(User user)
        {
            await Sleep();

            return user;
        }
		public async Task<User> Register(User user)
		{
			await client.GetTable<User>().InsertAsync(user);
			return user;
		}