Add Changlog entry for record size extension

Signed-off-by: Waleed Elmelegy <waleed.elmelegy@arm.com>
diff --git a/ChangeLog.d/add-record-size-limit-extension-support.txt b/ChangeLog.d/add-record-size-limit-extension-support.txt
new file mode 100644
index 0000000..ca1a7c2
--- /dev/null
+++ b/ChangeLog.d/add-record-size-limit-extension-support.txt
@@ -0,0 +1,2 @@
+Features
+   * Add support for sending and receiving Record Size Limit extension.