Extend the README to describe how to run the TLS demos

We also supply some test certificates for use with the demos.

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Toma

Extend the README to describe how to run the TLS demos

We also supply some test certificates for use with the demos.

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22552)

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