add lib/CMSIS_5 v5.7 locally

lib/CMSIS_5/CMSIS/RTOS2/RTX/Template/main.c

@@ -0,0 +1,28 @@
+/*----------------------------------------------------------------------------
+ * CMSIS-RTOS 'main' function template
+ *---------------------------------------------------------------------------*/
+ 
+#include "RTE_Components.h"
+#include  CMSIS_device_header
+#include "cmsis_os2.h"
+ 
+/*----------------------------------------------------------------------------
+ * Application main thread
+ *---------------------------------------------------------------------------*/
+__NO_RETURN static void app_main (void *argument) {
+  (void)argument;
+  // ...
+  for (;;) {}
+}
+ 
+int main (void) {
+ 
+  // System Initialization
+  SystemCoreClockUpdate();
+  // ...
+ 
+  osKernelInitialize();                 // Initialize CMSIS-RTOS
+  osThreadNew(app_main, NULL, NULL);    // Create application main thread
+  osKernelStart();                      // Start thread execution
+  for (;;) {}
+}