Add change log

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/ChangeLog.d/tls13_sig_alg_selection.txt b/ChangeLog.d/tls13_sig_alg_selection.txt
new file mode 100644
index 0000000..8857750
--- /dev/null
+++ b/ChangeLog.d/tls13_sig_alg_selection.txt
@@ -0,0 +1,3 @@
+Features
+   * Add support for opaque keys as the private keys associated to certificates
+     for authentication in TLS 1.3.