rot14 readme for the exams

subjects/rot14prog.en.md

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+## rot14
+
+### Instructions
+
+Write a program that prints the `string` passed as argument, transformed into a `rot14 string`.
+
+### Usage
+
+```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
+
+student@ubuntu:~/rot14prog$ ./rot14prog
+
+student@ubuntu:~/rot14prog$
+```