Added README file to the krb425 library

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@5671 dc483132-0cff-0310-8789-dd5450dbe970

diff --git a/src/lib/krb425/README b/src/lib/krb425/README
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+This library exports the Kerberos V4 API, acts as a glue layer to the
+Kerberos V5 library.  However convenient this sounds, in general
+practice the use of this library is not recommened, and its use is not
+supported.  In fact, it hasn't even been updated to the new V4 API
+changes yet.
+
+The reason for this is that while it represents a simple and easy way
+to convert an application program which was written to the Kerberos V4
+API to use the Kerberos V5 protocol, the way which the Kerberos V5 protocol
+is used is not guaranteed to be standardized in any way.
+
+Application programmers are urged to take the time to recode their
+applications to call either the Kerberos V5 library directly or better
+yet to use the GSSAPI library.  Changes to the application protocol
+may be necessary in either case, but the end result will be much
+cleaner and in all likelihood much more interoperable.
+
+                                               Theodore Ts'o
+                                               May 1, 1995