parameters counter exam exercise readme

subjects/paramcount.md

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+## paramcount
+
+### Instructions
+
+Write a program that displays the number of arguments passed to it, followed by
+a newline.
+
+If there are no arguments, just display a 0 followed by a newline.
+
+Example of output :
+
+```console
+student@ubuntu:~/student/paramcount$ go build
+student@ubuntu:~/student/paramcount$ ./paramcount 1 2 3 5 7 24
+6
+student@ubuntu:~/student/paramcount$ ./paramcount 6 12 24 | cat -e
+3$
+student@ubuntu:~/student/paramcount$ ./paramcount | cat -e
+0$
+student@ubuntu:~/student/paramcount$
+```