Added submodule contents into tree

externals/mbedtls/library/ssl_client.h

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+/**
+ *  TLS 1.2 and 1.3 client-side functions
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#ifndef MBEDTLS_SSL_CLIENT_H
+#define MBEDTLS_SSL_CLIENT_H
+
+#include "common.h"
+
+#if defined(MBEDTLS_SSL_TLS_C)
+#include "ssl_misc.h"
+#endif
+
+#include <stddef.h>
+
+MBEDTLS_CHECK_RETURN_CRITICAL
+int mbedtls_ssl_write_client_hello(mbedtls_ssl_context *ssl);
+
+#endif /* MBEDTLS_SSL_CLIENT_H */