You wan't to help us improve VyOS? This is awesome. We accept any kind of Pull Requests on GitHub. To make the life of the maintainers and you as future contributor (or maybe maintainer) much easier we have come up with some basic rules. Instead of copy/pasting or maintaining two instances of how to contribute to VyOS you can find the entire process documented in our online documentation: https://docs.vyos.io/en/latest/contributing/development.html
Also this guide might not be complete so any PR is much appreciated.
It might also worth browsing our blog: https://blog.vyos.io