Add ADR for DSS

0003-use-dss.md

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+# 3. Use the DSpace Submission Service (DSS)
+
+## Status
+
+Accepted
+
+## Context
+
+After completing the initial engineering plan for Wiley Deposits, it was
+discovered that ETD has a similar use case for depositing items into DSpace. 
+DSpace submission message-oriented middleware was created (based partly on original work by Eric), taking into account
+architectural and use case input from the Wiley team. We want to minimize unnecessary duplicate functionality
+across applications and reuse middleware, in accordance with MIT Libraries architecture principles. Preliminary 
+testing indicates that DSS is functional.
+
+## Decision
+
+We will use the DSpace Submission Service, instead of using the DSpace API directly.
+
+## Consequences
+
+* The Wiley codebase will be dependent on this service for timely and error-free ingests into DSpace.
+* The Wiley project will validate metadata (and PDFs) as DSS service contract may not do validation checks.
+* Features not provided by DSS (e.g., notifications) will still be implemented in AWD.