Add support for clustering

Author: robin-nitrokey

CHANGELOG.md

@@ -2,7 +2,11 @@
 
 ## Unreleased
 
--
+### Features
+
+- Add support for clustering:
+  - Add `ClusterMember` class
+  - Add `add_cluster_member`, `list_cluster_members`, `set_cluster_member_urls`, `remove_cluster_member`, `get_cluster_ca_certificate`, `set_cluster_ca_certificate` functions to `NetHSM`
 
 [All Changes](https://github.com/Nitrokey/nethsm-sdk-py/compare/v2.0.1...HEAD)