Add The Katharos License

[zicklag]

This adds my organization's new Katharos License to the license list. If there is review required or extra criteria for a license appearing in this list just let me know. I figured a PR was the easiest way to open the discussion. The README or the license preamble pretty much gives the outline of the license and its purpose. Let me know if you have any questions! :smiley:

[CoralineAda]

Hi there. Sorry for the long delay in responding. We're going to leave this PR open for a while longer, as we get consensus internally on explicit and fair criteria for the licenses that we promote. Thanks for being patient.