Modify the file main.cpp for M487

Revision:
0:0dfa64725959
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Sep 29 05:44:18 2017 +0000
@@ -0,0 +1,28 @@
+#include "mbed.h"
+#include "rtos.h"
+#if defined(TARGET_NUMAKER_PFM_NUC472)
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+#elif defined(TARGET_NUMAKER_PFM_M453)
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+#elif defined(TARGET_NUMAKER_PFM_M487)
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+#endif
+
+void led2_thread(void const *args) {
+    while (true) {
+        led2 = !led2;
+        Thread::wait(1000);
+    }
+}
+ 
+int main() {
+    Thread thread(led2_thread);
+    
+    while (true) {
+        led1 = !led1;
+        Thread::wait(500);
+    }
+}