add README so I don't forget how this branch is special

xwords4/linux/README.MOVELIST_BRANCH

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+*** Note on how the runs-and-waits-to-be-fed-racks feature of this ***
+                         *** branch works ***
+
+You start the app in one terminal/process and feed it data from
+another.  Feed it boards via one named pipe and racks (palettes) via
+another.  Feeding it a board changes its configuration and effects
+subsequent racks.  Feeding it a rack causes it to print out all the
+moves possible using that rack and the most recent board you fed it.
+
+When you first start it, it has an empty board (unless you provide one
+via the --board param).  You can feed it racks at that point if you
+want.
+
+So, some examples:
+
+1) Make a couple of pipes
+
+# mkfifo /tmp/board_pipe
+# mkfifo /tmp/rack_pipe
+
+Start it up (in one terminal), giving it a dictionary and the two
+pipes
+
+# ./obj_linux_rel/xwords --board-pipe /tmp/board_pipe --rack-pipe /tmp/rack_pipe --game-dict dict.xwd
+
+If you want to be able to tell when per-rack output begins and ends,
+e.g. to have an automated process more readily detect the end of the
+(possibly empty) output for a single rack, use the --rack-header and
+--rack-footer params, e.g. --rack-header '---HEADER---' --rack-footer
+'---FOOTER---'
+
+It will keep running now, so switch to another terminal.  Remember
+that it has an empty board
+
+# echo DESTROY > /tmp/rack_pipe
+
+You'll see this appear on the original terminal
+---HEADER---
+0080:HhD:STROYED:STROYED
+0080:HhA:STROYED:STROYED
+0080:HfD:DESTROY:DESTROY
+0080:FhA:DESTROY:DESTROY
+0076:HfD:STROYED:STROYED
+0076:HdD:DESTROY:DESTROY
+0076:FhA:STROYED:STROYED
+0076:DhA:DESTROY:DESTROY
+0074:HhD:DESTROY:DESTROY
+0074:HhA:DESTROY:DESTROY
+skipping remaining 1172 moves
+---FOOTER---
+
+There are four :-delimited columns.  The first is the score.  The
+second where the first tile is placed and direction: column, row, and
+D for down or A for across.  Then the tiles placed.  And finally the
+word formed -- which may include tiles that were already on the board.
+The latter two will be different after we load a board with contents.
+Here's one:
+
+# cat board.txt
+...............
+...............
+...............
+...............
+...............
+........T......
+.......DOWN....
+.......ON......
+........G......
+........U......
+.....TAKE......
+...............
+...............
+...............
+...............
+
+# cat board.txt > /tmp/board_pipe
+
+then
+# echo DESTROY > /tmp/rack_pipe
+
+And from the other terminal:
+---HEADER---
+0090:EiD:DESTROY:DESTROY
+0089:IlA:DESTROY:DESTROY
+0088:LaD:DESTROY:DESTROY
+0086:LcD:STROYED:STROYED
+0084:IlA:STROYED:STROYED
+0083:LgD:STROYED:STROYED
+0083:AlA:DESTROY:DESTROY
+0074:KaD:DRYSTOE:DRYSTONE
+0071:LeD:DESTROY:DESTROY
+0048:HlD:YTES:KYTES
+skipping remaining 1051 moves
+---FOOTER---
+
+Note that with the line 0074:KaD:DRYSTOE:DRYSTONE the word formed and
+tiles used are different: 'N' is used off the board.