add a license
I noticed that the SIAMCAT repo doesn't include a license. I believe that that means that no-one is allowed to copy it and use it (e.g. https://www.infoworld.com/article/2615869/open-source-software/github-needs-to-take-open-source-seriously.html). It would be a good idea to discuss and agree upon an appropriate license (perhaps CC-BY?).
Without a license, users are likely to be either, (unintentionally) copying and using SIAMCAT in breach of copyright, or afraid to use the tool without knowing what restrictions may be enforced in future.