ctf-cs: add hex to binary

Author: rudymatela

ctf-cs.tex

@@ -58,6 +58,7 @@ \section{Encoding / Decoding}
 \li[(de)code caesar's] \$ caesar [0-25]
 \li[Encode morse] \$ morse -s ~~~~~\I{message}
 \li[Decode morse] \$ morse -d -{-}~~~\I{...~-{-}-~...}
+\li[Hex to binary] \$ echo '48656c6c6f0a' | xxd -r -p
 \end{ldesc}