nrune program for the exams

subjects/nruneprog.en.md

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+## nruneprog
+
+### Instructions
+
+Write a function that returns the nth `rune` of a `string`.
+
+### Expected output :
+
+```console
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 2
+e
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 4
+l
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 5
+o
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello"
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" f
+"f" is not an integer value
+student@ubuntu:~/piscine-go/nruneprog$ ./nruneprog "hello" 9
+Invalid position: "9" in "hello"
+student@ubuntu:~/piscine-go/nruneprog$
+```