Add client for assisted volume snapshots API.

This will invoke post and delete calls on os-assisted-volume-snapshots
endpoint.

Closes-bug: #1668407

Co-Authored-By: Ghanshyam Mann <gmann@ghanshyammann.com>

Change-Id: I81e8fd9f89ec1cb00fc0116c31f9c0559406164
diff --git a/releasenotes/notes/add-assisted-volume-snapshot-client-737f5cb35d58c1b6.yaml b/releasenotes/notes/add-assisted-volume-snapshot-client-737f5cb35d58c1b6.yaml
new file mode 100644
index 0000000..5498688
--- /dev/null
+++ b/releasenotes/notes/add-assisted-volume-snapshot-client-737f5cb35d58c1b6.yaml
@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Add a new client to handle requests to create and delete assisted volume snapshots.