Adds a person to a client. Password is optional and if not supplied, an invitation will be emailed to the person

def add(self, client_id, email_address, name, access_level, password):
        """Adds a person to a client. Password is optional and if not supplied, an invitation will be emailed to the person"""
        body = {
            "EmailAddress": email_address,
            "Name": name,
            "AccessLevel": access_level,
            "Password": password}
        response = self._post("/clients/%s/people.json" %
                              client_id, json.dumps(body))
        return json_to_py(response)