Feature/podspec

[daaa57150]

Hi,

I added a podspec so that I could use Laurine in my project using cocoapods.

It's easier for projects already using cocoapods because there is nothing else to install, just add it to the Pod file and do the usual and it's available for the build script. Also the path to use in the build script is the same for everyone.

I'm using it currently in my project, and I'm happy I can use it this way, because my collaborators won't have any configuration/install to do. Same for the CI, nothing more to configure (although I did not test that yet).

The PR is there if you want it.