feat: add lab-rv32i-freertos-sw-timer card

src/common/lab_io.h

@@ -0,0 +1,10 @@
+#ifndef LAB_IO_H
+#define LAB_IO_H
+
+#include <stdint.h>
+
+void lab_puts( const char * text );
+void lab_put_u32( uint32_t value );
+void lab_exit( uint32_t code ) __attribute__( ( noreturn ) );
+
+#endif