Add adr for django

Fixes #187

docs/adr/0005-django-framework.md

@@ -0,0 +1,32 @@
+# 5. Uee django framework for python backend
+
+Date: 2023-08-11
+
+## Status
+
+Accepted
+
+## Context
+
+We need to provide a python http server to deliver the UI and handle the files.
+
+## Decision
+
+We will use the Django framework for two reasons
+
+ - the team is very familiar with it
+ - there's a high likelihood of needing a db for this project in future, and
+   django has good support for migrations.
+
+## Consequences
+
+
+### Pros
+
+ - familiarity
+ - strong db support
+
+### Cons
+
+ - larger dependency than needed for the initial scope
+ - currenly uses in-memory db, which logs some spurious migration errors on startup