update of rot14 test programs

subjects/rot14prog.en.md

@@ -8,8 +8,8 @@ Write a program that prints the `string` passed as argument, transformed into a
 
 ```console
 student@ubuntu:~/rot14prog$ go build
-student@ubuntu:~/rot14prog$ ./rot14prog "Hello How are You"
-Vszzc Vck ofs Mci
+student@ubuntu:~/rot14prog$ ./rot14prog "Hello How are You" | cat -e
+Vszzc Vck ofs Mci$
 student@ubuntu:~/rot14prog$ ./rot14prog Hello How are You
 
 student@ubuntu:~/rot14prog$ ./rot14prog

subjects/rot14prog.fr.md

@@ -0,0 +1,18 @@
+## rot14
+
+### Instructions
+
+Écrire un programme qui retourne la `string` en paramètre transformée en `string rot14`..
+
+### Utilisation
+
+```console
+student@ubuntu:~/rot14prog$ go build
+student@ubuntu:~/rot14prog$ ./rot14prog "Hello How are You" | cat -e
+Vszzc Vck ofs Mci$
+student@ubuntu:~/rot14prog$ ./rot14prog Hello How are You
+
+student@ubuntu:~/rot14prog$ ./rot14prog
+
+student@ubuntu:~/rot14prog$
+```