Add an ADR for indexing policy re: visibility

architecture-decisions/0007-indexing-visibility.md

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+# 7. Indexing resources with non-public visibility
+
+Date: Archaeological
+
+## Status
+
+Accepted
+
+## Context
+
+Figgy resources may have any of the following visibilities:
+- Open (public)
+- Princeton (netid)
+- On Campus (ip)
+- Reading Room
+- Private
+
+For each of these we need a policy regarding whether it will be indexed in DPUL.
+
+We used to index only public / complete items. But to support the music reserves
+collection we need pages that would have a viewer for logged-in institutional
+users only.
+
+## Decision
+
+Resources with the following visibilities should index into DPUL:
+- Open (public)
+- Princeton (netid)
+- On Campus (ip)
+
+This is implemented with a token authentication mechanism in `iiif_resource#def
+url`
+
+## Consequences
+
+* Users will see metadata for resources they may not be able to access.
+* Users with access will be able to search everything they can view.
+* There's no support in DPUL for private or reading room material.