CI

[arokem]

Should add continuous build and test infrastructure

[arokem]

These links look potentially helpful:

https://cristianadam.eu/20191222/using-github-actions-with-c-plus-plus-and-cmake/
https://github.com/marketplace/actions/run-cmake

But I have no experience doing CI for CPP code-bases (and only very little experience with CPP generally), so I am out of my depth.

[mattcieslak]

I think we can close this one?

[arokem]

Closed through #9 and #11