Add changelog entry

Signed-off-by: Kusumit Ghoderao <Kusumit.Ghoderao@silabs.com>
diff --git a/ChangeLog.d/add-pbkdf2-hmac.txt b/ChangeLog.d/add-pbkdf2-hmac.txt
new file mode 100644
index 0000000..97b7b46
--- /dev/null
+++ b/ChangeLog.d/add-pbkdf2-hmac.txt
@@ -0,0 +1,3 @@
+Features
+   * Add PBKDF2-HMAC implementation with PSA API for
+     key derivation