Add Changelog entry

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/ChangeLog.d/muladdc_microblaze.txt b/ChangeLog.d/muladdc_microblaze.txt
new file mode 100644
index 0000000..70fdff0
--- /dev/null
+++ b/ChangeLog.d/muladdc_microblaze.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * Fix support for little-endian Microblaze when MBEDTLS_HAVE_ASM is defined.
+     Contributed by Kazuyuki Kimura to fix #2020.