Add C++ Client release note 4.0.1 (#1084)

Author: BewareMyPower

data/release-cpp.js

@@ -0,0 +1,14 @@
+---
+id: client-cpp-4.0.1
+title: Client CPP 4.0.1
+sidebar_label: Client CPP 4.0.1
+---
+
+## What's Changed
+* Fix the seek method could be blocked forever when subscribe RPC is slower than seek RPC by @BewareMyPower in https://github.com/apache/pulsar-client-cpp/pull/533
+* [improve][client] Add TLSv1.3 support by @ciuncan in https://github.com/apache/pulsar-client-cpp/pull/529
+
+## New Contributors
+* @ciuncan made their first contribution in https://github.com/apache/pulsar-client-cpp/pull/529
+
+**Full Changelog**: https://github.com/apache/pulsar-client-cpp/compare/v4.0.0...v4.0.1