Giving up on trying to ignore selective parts of demo directory

.gitignore

@@ -1,6 +1,5 @@
 games/*
 !games/README.md
-demo/
+#demo
 !demo/README.md
 !demo/move
-!demo/move/*

demo/README.md

@@ -0,0 +1,16 @@
+The `move` directory gives a complete demonstration game, one move per file.
+
+An entire example game repository can then be build from these moves:
+
+```
+mkdir git
+cd git
+git init
+for i in ../move/*; do \
+ echo cp $i board \; \
+ git add board \; \
+ git commit -m \
+  \""Applying move #" $(basename $i .md)\"; \
+done | sh
+cd ..
+```