doc: init adr

docs/adr/0001-record-architecture-decisions.md

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+# 1. Record architecture decisions
+
+Date: 2023-07-26
+
+## Status
+
+Accepted
+
+## Context
+
+We need to record the architectural decisions made on this project.
+
+## Decision
+
+We will follow the decisions recorded in the central organizational 
+repository ([.github](https://github.com/openscd/.github)), 
+and record new repo-specific decisions in this repository.
+
+We write ADRs in the `docs` folder instead of a standard `doc`, 
+because `doc` is used for the generated documentation.
+
+## Consequences
+
+- It will be harder to track which decisions have to be taken into consideration
+- Local decisions will be easier to find