add a meson.build file, tests and update the README.MD

[peter-urban]

This adds a meson.build file (see issue #72)
I also added a related test matrix updated the README.MD to report how to build the project using meson.

The build file allows installing and testing the project using different configurations.
When installing, it also installs a package config file which should ease integrating with e.g. CMAKE
However I didn't actually test the package config file (Happy to support you if you run into problems though)

The build file also allows for directly integrating the project as subproject into existing meson
projects (this is what I use it for at the moment)

Happy to receive feedback on this PR, I'd also be happy to support maintaining this file.
Cheers

[efiring]

I'm not very experienced with github actions or with meson, so I defer to @ocefpaf for any detailed checking. It all looks reasonable, and the tests pass (a lot of tests!).

In addition to the changes you made to README, the meson additions should be added to the file list in README-developer.

[ocefpaf]

I'm not very experienced with github actions or with meson, so I defer to @ocefpaf for any detailed checking. It all looks reasonable, and the tests pass (a lot of tests!).

LGTM. Indeed the test matrix got quite big. I wonder if we could do both shared and static in one go... But then it would be hard to find things in the logs, so probably not worth it. (And this runs quite fast, probably fine as-is.)

[peter-urban]

I'm not very experienced with github actions or with meson, so I defer to @ocefpaf for any detailed checking. It all looks reasonable, and the tests pass (a lot of tests!).

In addition to the changes you made to README, the meson additions should be added to the file list in README-developer.

I added meson.build and meson.options to the README and README-developer file manifest.