ADR-0002 Choosing license (#1)

* Update README with license and shield information

Add licensing information and shields to README

* Add CC BY-SA 4.0 LICENSE

* Add ADR002: Use CC BY-SA 4.0 License

* Refine ADR002: Clarify CC BY-SA 4.0 License Context and Decision Criteria

* Update README to correct formatting and enhance clarity of technical architecture governance description

* Apply suggestion from @jwindhager

Co-authored-by: Jonas Windhager <jonas@windhager.io>

* Refactor ADR-0002 title for consistency and clarity; add license file and badge information to README

---------

Co-authored-by: Jonas Windhager <jonas@windhager.io>

Author: jhagberg