LP#1748924 Add release notes

Signed-off-by: Dan Wells <dbw2@calvin.edu>
Signed-off-by: Jeff Godin <jgodin@tadl.org>

diff --git a/docs/RELEASE_NOTES_NEXT/Circulation/billing_ts_now_reflect_billing_time.adoc b/docs/RELEASE_NOTES_NEXT/Circulation/billing_ts_now_reflect_billing_time.adoc
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+Enhanced Billing Timestamp Support
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Previously, billings had to make do with a single timestamp attempting
+to fill two different roles.  In the case of an overdue fine, the
+timestamp represented the *end* of the fine period for that billing,
+while for all other fines, the timestamp was merely the time the bill
+was created.  This setup generally worked, but not without confusion,
+and limited our ability to understand and process the data.
+
+Billings will now have up to three timestamps: a create date, and when
+applicable, a fine period start and a fine period end.  This clarifies
+and simplifies things like backdating, retrospective fine generation,
+account balancing for negative balance avoidance, and billing timeline
+views.