Update README.md

Author: LeeReindeer

README.md

@@ -12,11 +12,15 @@ RTOS implementation. Get more information on [my blog](https://leer.moe/2019/05/
 
 ## Porting
 
-Implement following four function in your own porting file:
+Implement following 4 functions in your own porting file:
 
 ```c
 void ros_init_timer();
 void ros_idle_task();
 void ros_task_context_init(ROS_TCB *tcb_ptr, task_func task_f, void *stack_top);
 void ros_switch_context(ROS_TCB *old_tcb, ROS_TCB *new_tcb);
 ```
+
+## Related Project
+
+- [s_task - full platform multi-task library for C](https://github.com/LeeReindeer/ROS/issues/1)