CLI apps transfer to Userspace

src/kernel/userland/shutdown.c

@@ -0,0 +1,9 @@
+#include <stdlib.h>
+#include <syscall.h>
+
+int main(int argc, char **argv) {
+    (void)argc; (void)argv;
+    printf("Shutting down...\n");
+    sys_system(13, 0, 0, 0, 0); // SYSTEM_CMD_SHUTDOWN
+    return 0;
+}