Add ADR

Author: Ware, Joseph (DLSLtd,RAL,LSCI)

docs/explanations/decisions/0020-debugpy.md

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+# 20. Add debugpy to service Dockerfile
+
+Date: 2025-03-18
+
+## Status
+
+Accepted
+
+## Context
+
+Developers require a way to debug containerized services in e.g. Kubernetes.
+
+## Decision
+
+Add debugpy to the container image that is produced for services.
+
+## Consequences
+
+Debugging containerized services has a clear and documented path.