Pkgconfig

[phodina]

Hi,
thanks for an amazing library and LiveCaptions!

This adds the following:

• package version in CMakeLists.txt (better to have some releases and not just grab commits)
• template for pkg-config file (so it can be used as dependency)
• installation target for pkg-config.

I'd like to see LiveCaptions running on Alpine Linux on my "old" phone OnePlus 6 running PostmarketOS.

[phodina]

I'll try to push one more PR for CMake install targets since the files have to be manually installed in the APKBUILD. Also other package managers will benefit from calling just DESTDIR="$pkgdir" cmake --install build

[nekowinston]

It might be worth noting that #9 does some of the same things.

[phodina]

Thanks, yeah looks like it does the same mostly + Nix stuff

[abb128]

I went ahead and merged the nix flake PR, is any of this still needed?

[phodina]

@abb128 Most of stuff is already there.

The only major missing this is the versioning to keep compatibility through SONAME. Here's how to set the CMAKE variable.