Add Changelog for license

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/ChangeLog.d/license.txt b/ChangeLog.d/license.txt
new file mode 100644
index 0000000..0b6bb1f
--- /dev/null
+++ b/ChangeLog.d/license.txt
@@ -0,0 +1,3 @@
+Changes
+   *  Mbed TLS is now released under a dual Apache-2.0 OR GPL-2.0-or-later
+      license. Users may choose which license they take the code under.