Added changelog

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
diff --git a/ChangeLog.d/x509-add-ca_istrue.txt b/ChangeLog.d/x509-add-ca_istrue.txt
new file mode 100644
index 0000000..4594c22
--- /dev/null
+++ b/ChangeLog.d/x509-add-ca_istrue.txt
@@ -0,0 +1,4 @@
+Features
+   * Add new accessor to expose the `MBEDTLS_PRIVATE(ca_istrue)` member of
+     `mbedtls_x509_crt` structure. This requires setting
+     MBEDTLS_X509_EXT_BASIC_CONSTRAINTS.