Add a LICENSE file to the repo

[rekeye]

My team is going to write an app very similar to the kaspa-graph-indicator and was wondering if we could use the frontend part of the repo as a framework. We'd probably modify a bunch of stuff to make it work. The repo is public however it has no license so we cant really use it since it follows the default copyright rights. So my question is if some license could be added?

For reference info on repos without a license