Add change log and migration guide
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/ChangeLog.d/rsa-padding.txt b/ChangeLog.d/rsa-padding.txt
new file mode 100644
index 0000000..5f9c11f
--- /dev/null
+++ b/ChangeLog.d/rsa-padding.txt
@@ -0,0 +1,5 @@
+API changes
+ * mbedtls_rsa_init() now always selects the PKCS#1v1.5 encoding for an RSA
+ key. To use an RSA key with PSS or OAEP, call mbedtls_rsa_set_padding()
+ after initializing the context. mbedtls_rsa_set_padding() now returns an
+ error if its parameters are invalid.