started a subdir for the book

book/examples/chapter5/FoodsCat.gf

@@ -0,0 +1,7 @@
+--# -path=.:present
+
+-- (c) 2009 Jordi Saludes under LGPL
+
+concrete FoodsCat of Foods = FoodsI with 
+  (Syntax = SyntaxCat),
+  (LexFoods = LexFoodsCat) ;