Support for FreeRTOS

[PratikAher20]

@dzbaker and @dmknutsen nasa/osal#620 (comment) I had this issue. Can you please help me to get the support for FreeRTOS-CFS.

[dzbaker]

Hi @PratikAher20. We don't provide support for FreeRTOS, but it looks like support has been developed here: https://github.com/pztrick/cfs-freertos.