fix README.md for 2004/arachnid

2004/arachnid/README.md

@@ -8,48 +8,56 @@
 
     http://www.notdot.net/
 
-## To build:
+# To build:
 
-        make all
+```sh
+make
+```
 
-### To run
+### To run:
 
-	./arachnid [mazefile]
+```sh
+./arachnid [mazefile]
+```
 
 ### Try:
 
-	./arachnid arachnid.info
+```sh
+./arachnid arachnid.info
+```
 
 ## Judges' comments
 
-    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.
+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!
+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 comments
 
-    This program accepts ASCII formatted mazes as input, and renders
-    them onscreen for the user to explore, complete with Line Of Sight
-    - you cannot see parts of the maze your avatar (the '@') could not
-    have seen.
+This program accepts ASCII formatted mazes as input, and renders
+them onscreen for the user to explore, complete with Line Of Sight
+- you cannot see parts of the maze your avatar (the '@') could not
+have seen.
 
-    The maze files will be interpreted with spaces ' ' as gaps, tilde
-    '~' symbols (if any) as exits (which get represented as a NetHack
-    style '<' once loaded), and any other characters as walls.
+The maze files will be interpreted with spaces ' ' as gaps, tilde
+'~' symbols (if any) as exits (which get represented as a NetHack
+style '<' once loaded), and any other characters as walls.
 
-    Feed the program its own source for a default maze. Running it with
-    no command line parameters will do this. In a nice symmetry, the 
-    character constant '~' that recognises exits to input mazes itself 
-    forms the exit to the default maze. Another maze, 'maze1' has also 
-    been provided. This maze is 255x255, about the largest maze supported, 
-    for the particularaly insane maze explorers out there.
+Feed the program its own source for a default maze. Running it with
+no command line parameters will do this. In a nice symmetry, the 
+character constant '~' that recognises exits to input mazes itself 
+forms the exit to the default maze. Another maze, 'maze1' has also 
+been provided. This maze is 255x255, about the largest maze supported, 
+for the particularaly insane maze explorers out there.
 
-    Usage:
-    	./arachnid [mazefile]
+Usage:
 
-    You can explore the maze using the w,a,s, and d keys.
+```sh
+./arachnid [mazefile]
+```
 
+You can explore the maze using the w,a,s, and d keys.