Update MentOs code to the latest development version.

programs/sleep.c

@@ -0,0 +1,19 @@
+///                MentOS, The Mentoring Operating system project
+/// @file sleep.c
+/// @brief
+/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
+/// See LICENSE.md for details.
+
+#include <stdio.h>
+#include <time.h>
+
+int main(int argc, char **argv)
+{
+    if (argc == 2) {
+        int amount = atoi(argv[1]);
+        if (amount > 0) {
+            sleep(amount);
+        }
+    }
+    return 0;
+}