CreateFileDataManagerWithInitData initializes instance of FileDataManager and sets loaded data to serverData This factory function creates initialize with data instance of FileDataManager, error reserved for usage but always nil here * Parameters: * serverData already loaded data.ServerData from Json file in memory * Returns: context and error (currently is nil) */.

FileDataManager is the simplest Data Storage without any dependencies, it uses single JSON file (it is users and clients RO auth server) This context type is extremely useful for simple systems.