strrev program for the exams

subjects/strrevprog.en.md

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+## strrevprog
+
+### Instructions
+
+- Write a program that reverses a `string` and writes it in standard output.
+
+### Expected output :
+
+```console
+student@ubuntu:~/piscine-go/strrevprog$ go build
+student@ubuntu:~/piscine-go/strrevprog$ ./strrevprog "Hello World!"
+!dlroW olleH
+student@ubuntu:~/piscine-go/strrevprog$ ./strrevprog
+student@ubuntu:~/piscine-go/strrevprog$
+```