Add the tiger source code bundle from the book site

Signed-off-by: jmug <u.g.a.mariano@gmail.com>

tiger/testcases/test2.tig

@@ -0,0 +1,9 @@
+/* arr1 is valid since expression 0 is int = myint */
+let
+	type myint = int
+	type  arrtype = array of myint
+
+	var arr1:arrtype := arrtype [10] of 0
+in
+	arr1
+end