The source project of this merge request has been removed.
docs: add license and other docs
This PR adds the following files:
- CODE_OF_CONDUCT.md
- CONTRIBUTING.md
- LICENSE.txt
- NOTICE.md
- SECURITY.md
These files are copied from the mantle-api project.
In the NOTICE.md one link is adjusted to the RoadLogicSuite repository (other OpenPASS projects have the same NOTICE.md but each also with adjusted with their own repository link).