"Release notes" for the chess snippet.

1. Compatibility
----------------
  The snippet has been compiled and verified against stock Circle 3.1 only,
  and the installation instructions are written accordingly.
  
  
2. Installation instructions
----------------------------
  a. Put the files screen.h, chess.c and chess.h into the src/ directory.
     screen.h should be overwritten (it contains additional background
     color support), so answer yes if asked.

  b. Add compilation instructions for chess.c into the Makefile:
     If you have a virgin Makefile, run "patch Makefile Makefile.patch" in the src
     directory and cross your fingers, otherwise (or if the patch failed) do the 
     following manually in the Makefile:
     1. Tag on "chess.o" to the list of o-files (OBJFILES)
     2. Tag on "chess.c" to the list of c-files (CXREF_FILES)
     3. Add the following two lines at the end:

chess.o: chess.c chess.h structs.h handler.h utils.h sysdep.h screen.h
	$(CC) -c $(CFLAGS) chess.c

     The usual warning about tabs-to-spaces applies when copy-pasting them.

  c. Add the following lines into interpreter.c:
       Into the list of external ACMDs, add:
          ACMD(do_chess);
       and into the master command list, cmd_info, add:
            { "chess"    , POS_DEAD    , do_chess    , 0, 0 },

  d. Add the following line into the end of the #include list of db.c: 
        #include "chess.h"
     and in the same file, the following line in function free_char:
        free_game_of_chess(ch->player_specials->chess);
  e. Add the following line into the end of struct player_special_data in structs.h
        struct game_of_chess *chess;
  f. type "make".

3. Known bugs and limitations
-----------------------------
  * The en passant move is not implemented.
  * The game does not recognize check mate or when the king has fallen;
    ending the game is up to the players by resigning explicitly.
  * Promotion is always to queen.
  * Clients without color support will find the layout to be ugly.
  * The game has no save or replay capability.
  * This was written a long time ago, so the code is most likely...
    err... suboptimal. Feel free to improve, and remember to share.
 
4. Licensing
------------
This code is released in the Public Domain.
   
5. PS
-----
Live long and prosper.

   /Fredrik 051030 (fredrik_lannergren@yahoo.com)