SoftwareX requirements

SoftwareX has a couple of requirements for the repository:

• include README.txt
• include LICENSE.txt (try to find out which license is appropriate)
• tag corresponding with the version (agree on versioning)
• source code in a src/ directory, not the root of the repository
• documentation in a docs/ directory, and/or READMEs, as appropriate

I think most of that should be straight-forward. Putting source code in a dedicated src/ directory may require some refactoring.