src/ : mark as source
stubs/ : mark as resource root
tests/unit/: mark as test sources root
Inside of docker-files/php-extract/, there is a file called token.dist. Copy this to the same folder, call it "token" and add in a GitHub OAuth token. This is copied into the php-extract container so that it won't complain about API rate limits when updating composer for whatever reason.
You'll probably want a docker container with php-ast in it and php 7.
You'll have to procure those yourself.