Add reno releasenote configuration

Change-Id: I6d631de5609fb270053bd117bede7a87e3d42392
diff --git a/.releasenotes/notes/add-releasenotes-20cce0cea873f011.yaml b/.releasenotes/notes/add-releasenotes-20cce0cea873f011.yaml
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index 0000000..733776f
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+++ b/.releasenotes/notes/add-releasenotes-20cce0cea873f011.yaml
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+---
+summary: >
+  Use "reno", an releasenotes configuration tool to record release notes.
+  Documentation: https://docs.openstack.org/reno/latest
+
+  Example usage:
+
+  .. code-block:: shell
+
+    # to list/create/show release notes, run following commands
+    reno -qd .releasenotes list
+    reno -qd .releasenotes new releasenote-slug-title --edit
+    reno -qd .releasenotes report --no-show-source
+
+other:
+  - |
+    Added `reno <https://docs.openstack.org/reno/latest>_` configuration to track release notes
+    within the reclass-system git repository.