update of subjects en et fr

subjects/compareprog.en.md

@@ -4,9 +4,9 @@
 
 Write a program that behaves like the `Compare` function.
 
-This program prints a number comparing two strings lexicographically.
+This program prints a number after comparing two `strings` lexicographically.
 
-### Expected output :
+### Usage :
 
 ```console
 student@ubuntu:~/compareprog$ go build

subjects/compareprog.fr.md

@@ -0,0 +1,24 @@
+## compareprog
+
+### Instructions
+
+Écrire un programme qui se comporte comme la fonction `Compare`.
+
+Ce programme affiche un nombre après avoir comparé deux `strings` lexicalement.
+
+### Utilisation :
+
+```console
+student@ubuntu:~/compareprog$ go build
+student@ubuntu:~/compareprog$ ./compareprog a b | cat -e
+-1$
+student@ubuntu:~/compareprog$ ./compareprog a a | cat -e
+0$
+student@ubuntu:~/compareprog$ ./compareprog b a | cat -e
+1$
+student@ubuntu:~/compareprog$ ./compareprog b a d | cat -e
+$
+student@ubuntu:~/compareprog$ ./compareprog | cat -e
+$
+student@ubuntu:~/compareprog$
+```