Added descriptions of lutz, mpzpi.py and stoffel

Demo/README

@@ -12,8 +12,14 @@ ibrowse		An Emacs info file browser (uses stdwin).
 		See also ../doc (the Python library documentation can
 		be converted to info format).
 
+lutz		Some demos written by Mark Lutz -- includes a nice
+		enhanced Python shell!!!
+
 md5test		Test program for the optional md5 module.
 
+mpzpi.py	Currently the only test for mpz -- print digits of pi
+		(compare scripts/pi.py).
+
 rpc		A set of classes for building clients and servers for
 		Sun RPC.
 
@@ -22,6 +28,8 @@ rsa		An RSA public-key cryptosystem (needs mpz and md5).
 scripts		Some useful Python scripts that I put in my bin
 		directory.  No optional built-in modules needed.
 
+stoffel		Some games written by Stoffel Erasmus.
+
 sockets		Examples for the new built-in module 'socket'.
 
 sgi		Demos that only run on Silicon Graphics machines.