I came across ion buildong my project for the first time in freeRTOS using cortex m0+ processor with GCC compiler kindly help

threading.h: No such file or directory
34 | #include <threading.h>
i am using eclipse for embedded C

This header file is not from FreeRTOS. Where did you get the source code you are trying to compile? If you trying to get started with FreeRTOS, one way is to start with one of our pre-configured demo projects - FreeRTOS/FreeRTOS/Demo at main · FreeRTOS/FreeRTOS · GitHub

could you please tell which is the suitable port for my microcontroller which is burned on Xilinx FPGA (ARTYA7) with ARM cortexM0+ processor with GCC compiler i am using Eclipse for Embedded C IDE

This one - FreeRTOS-Kernel/portable/GCC/ARM_CM0 at main · FreeRTOS/FreeRTOS-Kernel · GitHub

Thank you could you please share its DEMO Project also ?

That would depend on your hardware. Here are couple of demo projects for some M0+ MCUs:

A couple of other links that may be helpful: