Add license

[henning-roos]

Description

Add licence file. Use https://github.com/eiffel-community/eiffel-repository-template/blob/master/LICENSE

Motivation

See https://github.com/eiffel-community/eiffel-repository-template/blob/master/CONTRIBUTING.md#license-management

[e-pettersson-ericsson]

The license from community repository is linked from the README. Is this enough to have? Can we close this issue @henning-roos ?

[henning-roos]

It might be enough, but GitHub consider it best practice to include it in the repository as LICENSE.txt or LICENSE.md (https://help.github.com/en/github/creating-cloning-and-archiving-repositories/licensing-a-repository).

The link to the license is also broken due to this.

There might also be some automatic stuff in GitHub concerning that file as well.

I would suggest keeping this open until it is solved.