build(libconfig): got build system and tests working

readme.md

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+# libconstants
+
+libconstants is the authoritative source for physical constants for the SERiF project.
+
+This has been broken out of the main serif project to allow for more modularity
+
+## Building
+In order to build libconstants you need `meson>=1.5.0`. This can be installed with `pip`
+
+```bash
+pip install "meson>=1.5.0"
+```
+
+Then from the root libconstants directory it is as simple as
+
+```bash
+meson setup build --buildtype=release
+meson compile -C build
+meson test -C build
+```
+
+this will auto generate a pkg-config file for you so that linking other libraries to libconstants is easy.
+