adding : brackets_matching subject

subjects/brackets_matching/README.md

@@ -0,0 +1,25 @@
+## brackets_matching
+
+### Instructions
+
+Write a program that takes an undefined number of `string` in arguments. For each argument, if the expression is correctly bracketed, the program prints on the standard output `OK` followed by a newline (`'\n'`), otherwise it prints `Error` followed by a newline.
+
+Symbols considered as brackets are parentheses `(` and `)`, square brackets `[` and `]` and curly 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 does not contain any bracket is considered as a correctly bracketed `string`.
+
+If there is no argument, the program must print nothing.
+
+### Usage
+
+```console
+student@ubuntu:~/[[ROOT]]/brackets$ ./brackets '(johndoe)' | cat -e
+OK$
+student@ubuntu:~/[[ROOT]]/brackets$ ./brackets '([)]' | cat -e
+Error$
+student@ubuntu:~/[[ROOT]]/brackets$ ./brackets '' '{[(0 + 0)(1 + 1)](3*(-1)){()}}' | cat -e
+OK$
+OK$
+student@ubuntu:~/[[ROOT]]/brackets$ ./brackets
+student@ubuntu:~/[[ROOT]]/brackets$
+```