Adds volume summary test reno

Adds release notes for volumes v3 client show_volume_summary test.

Change-Id: Ia5ab97976a783defb3f129269d105d768db4c54e
Partial-Bug: #1691528
diff --git a/releasenotes/notes/volume-summary-a3c3b010c1880bcb.yaml b/releasenotes/notes/volume-summary-a3c3b010c1880bcb.yaml
new file mode 100644
index 0000000..5074840
--- /dev/null
+++ b/releasenotes/notes/volume-summary-a3c3b010c1880bcb.yaml
@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Added test for volume summary API.