LP 1507807: Release Notes for In-House-Use Copy Alerts

LP 1507807: Release Notes for In-House-Use Copy Alerts

Add a release notes document explaining how the settings work.

If you want to test the functionality, you should set the settings to
true.  Next, find a copy with an alert message and another copy with
the check in alert set to true on its location.  Recording an
in-house-use for either of these copies should cause an alert to
display the respective message.  If a copy has both, then two alerts
will appear one after the other.

Resetting the settings to false or deleting the settings should stop
the alerts from displaying.

Signed-off-by: Jason Stephenson <jason@sigio.com>