static createJWT(user, jwtSecret) {
        return jwt.sign({
            username: user.username,
            h: shake256(user.password, SHAKE256_LENGTH),
        }, jwtSecret);
    }
Create a new JWT for a user
@param {User} user The User to create a JsonWebToken for
@param {string} jwtSecret The key used to sign the JsonWebToken
@returns {string} the JsonWebToken as a string