brainfuck exam exercise readme

subjects/brainfuck.en.md

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+## brainfuck
+
+### Instructions
+
+Write a Brainfuck interpreter program.
+The source code will be given as first parameter.
+The code will always be valid, with no more than 4096 operations.
+Brainfuck is a minimalist language. It consists of an array of bytes
+(in our case, let's say 2048 bytes) initialized to zero,
+and a pointer to its first byte.
+
+Every operator consists of a single character :
+- '>' increment the pointer ;
+- '<' decrement the pointer ;
+- '+' increment the pointed byte ;
+- '-' decrement the pointed byte ;
+- '.' print the pointed byte on standard output ;
+- '[' go to the matching ']' if the pointed byte is 0 (while start) ;
+- ']' go to the matching '[' if the pointed byte is not 0 (while end).
+
+Any other character is a comment.
+
+And its output :
+
+```console
+student@ubuntu:~/student/brainfuck$ go build
+student@ubuntu:~/student/brainfuck$ ./brainfuck "++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>." | cat -e
+Hello World!$
+student@ubuntu:~/student/brainfuck$ ./brainfuck "+++++[>++++[>++++H>+++++i<<-]>>>++\n<<<<-]>>--------.>+++++.>." | cat -e
+Hi$
+student@ubuntu:~/student/brainfuck$ ./brainfuck | cat -e
+$
+student@ubuntu:~/student/brainfuck$
+```