Add an initial guide page for writing a multi-stream QUIC client

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from #21765)

doc/build.info

@@ -4783,6 +4783,10 @@ DEPEND[html/man7/ossl-guide-quic-introduction.html]=man7/ossl-guide-quic-introdu
 GENERATE[html/man7/ossl-guide-quic-introduction.html]=man7/ossl-guide-quic-introduction.pod
 DEPEND[man/man7/ossl-guide-quic-introduction.7]=man7/ossl-guide-quic-introduction.pod
 GENERATE[man/man7/ossl-guide-quic-introduction.7]=man7/ossl-guide-quic-introduction.pod
+DEPEND[html/man7/ossl-guide-quic-multi-stream.html]=man7/ossl-guide-quic-multi-stream.pod
+GENERATE[html/man7/ossl-guide-quic-multi-stream.html]=man7/ossl-guide-quic-multi-stream.pod
+DEPEND[man/man7/ossl-guide-quic-multi-stream.7]=man7/ossl-guide-quic-multi-stream.pod
+GENERATE[man/man7/ossl-guide-quic-multi-stream.7]=man7/ossl-guide-quic-multi-stream.pod
 DEPEND[html/man7/ossl-guide-tls-client-block.html]=man7/ossl-guide-tls-client-block.pod
 GENERATE[html/man7/ossl-guide-tls-client-block.html]=man7/ossl-guide-tls-client-block.pod
 DEPEND[man/man7/ossl-guide-tls-client-block.7]=man7/ossl-guide-tls-client-block.pod
@@ -5000,6 +5004,7 @@ html/man7/ossl-guide-libssl-introduction.html \
 html/man7/ossl-guide-migration.html \
 html/man7/ossl-guide-quic-client-block.html \
 html/man7/ossl-guide-quic-introduction.html \
+html/man7/ossl-guide-quic-multi-stream.html \
 html/man7/ossl-guide-tls-client-block.html \
 html/man7/ossl-guide-tls-introduction.html \
 html/man7/ossl_store-file.html \
@@ -5139,6 +5144,7 @@ man/man7/ossl-guide-libssl-introduction.7 \
 man/man7/ossl-guide-migration.7 \
 man/man7/ossl-guide-quic-client-block.7 \
 man/man7/ossl-guide-quic-introduction.7 \
+man/man7/ossl-guide-quic-multi-stream.7 \
 man/man7/ossl-guide-tls-client-block.7 \
 man/man7/ossl-guide-tls-introduction.7 \
 man/man7/ossl_store-file.7 \

doc/man7/ossl-guide-quic-multi-stream.pod

@@ -0,0 +1,36 @@
+=pod
+
+=begin comment
+
+NB: Changes to the source code samples in this file should also be reflected in
+demos/guide/quic-multi-stream.c
+
+=end comment
+
+=head1 NAME
+
+ossl-guide-quic-multi-stream
+- OpenSSL Guide: Writing a simple multi-stream QUIC client
+
+=head1 SIMPLE MULTI-STREAM QUIC CLIENT EXAMPLE
+
+CONTENT HERE
+
+
+
+=head1 SEE ALSO
+
+L<ossl-guide-introduction(7)>, L<ossl-guide-libraries-introduction(7)>,
+L<ossl-guide-libssl-introduction(7)> L<ossl-guide-quic-introduction(7)>,
+L<ossl-guide-quic-client-block(7)>
+
+=head1 COPYRIGHT
+
+Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the Apache License 2.0 (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut