GUIlib: README: Note that this project is archived.

From b04921211bcf4fad520234fe04ec1535f4b40bee Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Mon, 20 Jun 2022 23:58:00 -0400
Subject: [PATCH] README: Note that this project is archived.

 README | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/README b/README
index b9f9513..8572876 100644
--- a/README
+++ b/README
@@ -1,4 +1,18 @@
+We did a quick update for SDL2 support, and then made the
+github repo read-only. This is here for historical
+purposes; it was used for an SDL_net sample app and
+maybe a few other things, but nothing serious and it
+hasn't been maintained in years.
+Do not use this in new code! And consider migrating away
+from it in old code, if you happen to be using it.
 This is a very simple GUI framework, for use with SDL.
 It is very flexible, but is by no means a complete windowing system.
 Feel free to improve it!! :)