Amazon-FreeRTOS has been termed as deprecated (see announcement) and with it, this repository has now become obselete. Please refer to Amazon FreeRTOS README for more details.
ESP-AFR-SDK is base software for supporting Amazon-FreeRTOS. Please note that it is not possible to use this repository in independent manner, it should always be used through main Amazon-FreeRTOS repository.
Please refer to getting started guide at https://docs.aws.amazon.com/freertos/latest/userguide/getting_started_espressif.html