Added a blurb and a TODO to cd-archive-rip.

cd-archive-rip

@@ -1,10 +1,14 @@
 #!/bin/bash
 
+# Rip a CD to a CHD file for archiving.
+
 disc_name="$1"
 if [ -e "$disc_name" ]; then
     echo "disc name required."
     exit 1
 fi
+
+# TODO: Don't assume there is only one optical drive.
 cdrdao read-cd --datafile "$disc_name.bin" --read-raw "$disc_name.toc" || exit 1
 toc2cue "$disc_name.toc" "$disc_name.cue" || exit 1
 chdman createcd -i "$disc_name.cue" -o "$disc_name.chd"