board_perf:add support for qcloud c-sdk on ch32v307 board

board/TencentOS_Tiny_CH32V307_EVB/examples/hello_world.c

@@ -0,0 +1,34 @@
+#include "tos_k.h"
+
+#define TASK1_STK_SIZE       1024
+k_task_t task1;
+uint8_t task1_stk[TASK1_STK_SIZE];
+
+
+#define TASK2_STK_SIZE       1024
+k_task_t task2;
+uint8_t task2_stk[TASK2_STK_SIZE];
+
+void task1_entry(void *arg)
+{
+    while (1) {
+        printf("###I am task1\r\n");
+        tos_task_delay(2000);
+    }
+}
+
+void task2_entry(void *arg)
+{
+    while (1) {
+        printf("***I am task2\r\n");
+        tos_task_delay(1000);
+    }
+}
+
+
+void application_entry(void *arg)
+{
+    tos_task_create(&task1, "task1", task1_entry, NULL, 3, task1_stk, TASK1_STK_SIZE, 0); // Create task1
+    tos_task_create(&task2, "task2", task2_entry, NULL, 3, task2_stk, TASK2_STK_SIZE, 0);// Create task2
+}
+