Create composer.json file in repository

[bmcclure]

This repo doesn't have a composer.json file, so it can't be directly installed via composer without adding a custom package definition on the "repositories" of a top-level composer.json file.

On the other hand, the instructions in this repository to install via composer actually ends up installing the base repository which does not have any PHP code in it.

It seems like the composer.json from the base repo actually belongs in this repo, with an updated autoload path?

[amklose]

I opened a pull request to the develop branch with a composer.json file added.