brackets exam exercise readme

subjects/brackets.en.md

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+## brackets
+
+### Instructions
+
+Write a program that takes an undefined number of strings in arguments. For each
+argument, the program prints on the standard output "OK" followed by a newline
+if the expression is correctly bracketed, otherwise it prints "Error" followed by
+a newline.
+
+Symbols considered as 'brackets' are brackets '(' and ')', square brackets '['
+and ']'and braces '{' and '}'. Every other symbols are simply ignored.
+
+An opening bracket must always be closed by the good closing bracket in the
+correct order. A string which not contains any bracket is considered as a
+correctly bracketed string.
+
+If there is no arguments, the program must print only a newline.
+
+And its output :
+
+```console
+student@ubuntu:~/student/test$ go build
+student@ubuntu:~/student/test$ ./test '(johndoe)' | cat -e
+OK$
+student@ubuntu:~/student/test$ ./test '([)]' | cat -e
+Error$
+student@ubuntu:~/student/test$ ./test '' '{[(0 + 0)(1 + 1)](3*(-1)){()}}' | cat -e
+OK$
+OK$
+student@ubuntu:~/student/test$ ./test | cat -e
+$
+student@ubuntu:~/student/test$
+```