Add alt code for 2004/arachnid for h/j/k/l keys

Now vi users can more easily enjoy this entry without getting
frustrated! Obviously that includes myself. Use j/k/l/h keys instead.
There's some circular fun in the README.md about this based on what the
judges' originally wrote (that made me laugh out loud because it's
true - I did get lost quite easily though I did solve it ...
eventually).

2004/arachnid/README.md

@@ -28,15 +28,32 @@ and then try:
 ./arachnid arachnid.c
 ```
 
+Navigation is through the use of the `wasd` inverted-T formation on
+QWERTY keyboards.  Rogue players, vi users, and Dvorak typists are
+invited to get lost (or use the alt version)!
+
+### Alternate code
+
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) added an alternate
+version which allows those like himself used to `h`, `j`, `k` and `l` movement
+keys to not get lost. Non rogue players, vi users and Dvorak typists are invited
+to get lost (or use the original version)! To use:
+
+```sh
+make alt
+```
+
+Use `arachnid.alt` as you would `arachnid` above.
+
+Thank you Cody!
+
+
 ## Judges' remarks:
 
 The fun part comes when you realize that the maze scrolls.  The overall
 visual effect is quite pleasing (at least on some displays), and, well,
 it's a lot of fun.
 
-Navigation is through the use of the "wasd" inverted-T formation on
-QWERTY keyboards.  Rogue players, vi users, and Dvorak typists are
-invited to get lost!
 
 ## Author's remarks: