Add change log for TLS 1.3 MVP

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/ChangeLog.d/tls13-mvp.txt b/ChangeLog.d/tls13-mvp.txt
new file mode 100644
index 0000000..2dd48cc
--- /dev/null
+++ b/ChangeLog.d/tls13-mvp.txt
@@ -0,0 +1,7 @@
+Features
+   * Mbed TLS provides a minimum viable implementation of the TLS 1.3
+     protocol. See docs/architecture/tls13-support.md for the definition of
+     the TLS 1.3 Minimum Viable Product (MVP). The MBEDTLS_SSL_PROTO_TLS1_3
+     configuration option controls the enablement of the support. The APIs
+     mbedtls_ssl_conf_min_version() and mbedtls_ssl_conf_max_version() allow
+     to select the 1.3 version of the protocol to establish a TLS connection.