Add PendingReleaseNotes

This patch adds PendingReleaseNotes to track upcoming changes in
release notes.

Signed-off-by: Niraj Yadav <niryadav@redhat.com>

Author: black-dragon74

PendingReleaseNotes.md

@@ -0,0 +1,15 @@
+# v0.13.0 Pending Release Notes
+
+## Breaking changes
+
+## Features
+
+- Allow override of precedence of key rotation and reclaim space related annotations
+  using a ConfigMap key `schedule-precedence`. The default is `pvc` which reads the
+  annotations in order of PVC > NS > SC. It can be set to `storageclass` to respect only
+  the annotations found on the Storage Classes.
+
+## NOTE
+
+- `sc-only`, a once valid value for `schedule-precedence` key is being deprecated in favor of
+  `storageclass` and will be removed in a later release.