Add README for QUIC demos directory

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23487)

diff --git a/demos/quic/README.md b/demos/quic/README.md
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+QUIC Demos
+==========
+
+This directory contains demos for the OpenSSL QUIC APIs.
+
+See also:
+
+- [HTTP/3 Client Demo](../http3/)
+- [QUIC Client DDD Demos](../doc/designs/ddd/)