add transplant to linux

board/Linux_Posix/hello_world/src/main.c

@@ -0,0 +1,53 @@
+#include "cmsis_os.h"
+
+#define TASK1_STK_SIZE		512
+void task1(void *arg);
+osThreadDef(task1, osPriorityNormal, 1, TASK1_STK_SIZE);
+
+#define TASK2_STK_SIZE		512
+void task2(void *arg);
+osThreadDef(task2, osPriorityNormal, 1, TASK2_STK_SIZE);
+
+void task1(void *arg)
+{
+    int count = 1;
+    while (1) {
+        printf("###This is task1, %d\r\n", count++);
+        osDelay(2000);
+    }
+}
+
+void task2(void *arg)
+{
+    int count = 1;
+    while (1) {
+#if TOS_CFG_TASK_STACK_DRAUGHT_DEPTH_DETACT_EN > 0u
+        k_err_t rc;
+        int depth;
+
+        rc = tos_task_stack_draught_depth(K_NULL, &depth);
+        printf("%d  %d\n", rc, depth);
+#endif
+
+        printf("***This is task2, %d\r\n", count++);
+        osDelay(1000);
+    }
+}
+
+void application_entry(void *arg)
+{
+    osThreadCreate(osThread(task1), NULL); // Create task1
+    osThreadCreate(osThread(task2), NULL); // Create task2
+}
+
+
+int main(void)
+{
+   osKernelInitialize(); //TOS Tiny kernel initialize
+   application_entry(NULL);
+   osKernelStart(); //Start TOS Tiny
+   
+   while (1)
+   {
+   }
+}