readme for the exr of the exams

subjects/options.en.md

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+# options
+
+## Instructions
+
+Write a program that takes an undefined number of arguments which could be considered as options and writes on standard output a representation of those options as groups of bytes followed by a newline.
+
+- An option is an argument that begins by a '-' and have multiple characters which could be :
+	- abcdefghijklmnopqrstuvwxyz
+
+- All options are stocked in a single int and each options represents a bit of that int, and should be stocked like this :
+
+	- 00000000 00000000 00000000 00000000
+	- ******zy xwvutsrq ponmlkji hgfedcba
+
+- Launch the program without arguments or with the '-h' flag activated must print an usage on the standard output, as shown in the following examples.
+
+- A wrong option must print "Invalid Option" followd by a newline.
+
+## Expected output
+
+```console
+student@ubuntu:~/piscine/test$ go build
+student@ubuntu:~/piscine/test$ ./test | cat -e
+options: abcdefghijklmnopqrstuvwxyz$
+student@ubuntu:~/piscine/test$ ./test -abc -ijk | cat -e
+00000000 00000000 00000111 00000111$
+student@ubuntu:~/piscine/test$ ./test -z | cat -e
+00000010 00000000 00000000 00000000$
+student@ubuntu:~/piscine/test$ ./test -abc -hijk | cat -e
+options: abcdefghijklmnopqrstuvwxyz$
+student@ubuntu:~/piscine/test$ ./test -% | cat -e
+Invalid Option$
+student@ubuntu:~/piscine/test$
+```