Added ruff ADR

docs/decisions/0002-use-ruff-for-linting-and-formatting.md

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+# Use ruff for Python code linting and formatting
+
+## Context and Problem Statement
+
+We want to ensure committed code is checked for common errors and is formatted with a standard style. Given the
+number of alternatives that currently exist and the project requirements, which would be an appropriate choice?
+
+
+## Considered Options
+
+* [ruff](https://docs.astral.sh/ruff/)
+* [flake8](https://flake8.pycqa.org/en/latest/) + [black](https://black.readthedocs.io/en/stable/index.html)
+
+
+## Decision Outcome
+
+Chosen option: "ruff", because it does both linting and formatting, supports all relevant features of the 
+"flake8 + black" option and is fast to operate
+
+### Consequences
+
+* Good, because it is easy to install and setup
+* Good, because it is fast to execute
+* Good, because it is configurable
+* Good, because it contains a large number of built-in rules