Add changelog entry

Signed-off-by: Aditya Deshpande <aditya.deshpande@arm.com>
diff --git a/ChangeLog.d/psa_driver_wrapper_for_raw_key_agreement.txt b/ChangeLog.d/psa_driver_wrapper_for_raw_key_agreement.txt
new file mode 100644
index 0000000..b9c78a6
--- /dev/null
+++ b/ChangeLog.d/psa_driver_wrapper_for_raw_key_agreement.txt
@@ -0,0 +1,5 @@
+Features
+   * Add a driver dispatch layer for raw key agreement, enabling alternative
+     implementations of raw key agreement through the key_agreement driver
+     entry point. This entry point is specified in the proposed PSA driver
+     interface, but had not yet been implemented.